Bull
What other purpose is there? Same protection can be provided with a hunting rifle or shotgun. So truthfully what do they provide you that a simpler weapon couldn't?
*Disclaimer: I'm not responding entirely to what you posted, or what I think you believe. I'm new here, so I'm kinda doing a data dump on this one (forgive the length) and will respond to what you posted in context, but most of it responds to boiler-plate arguments I've read on the InnerWebTubez.*
Problem is, it's all subjective and often presumptive. In the first place, in regards to the "dangerousness" of a particular firearm and in the second place in regards to the motives anybody might have for wanting/owning one. As for the first part, there is no firearm that isn't dangerous. Plain and simple. So it is illogical to ban *this* gun but not *that* gun on the basis of perceived levels of dangerousness.
Many fallacies abound. For one, the idea that AR15s are "too high caliber" for civilians and non-LEO, but a hunting rifle is OK. Well, an AR shoots a .22 caliber round, whereas most hunting rifles are .270 on up, typically .30 caliber (.308 and .30-06). This of course doesn't count feral hog hunting, in which the preferred rifle is ... well, the AR15. With a 30 round mag. Several, actually. Because there could be 20-40 hogs in an encounter. Which can be dangerous not only to crops but those who try to thin their numbers.
"Well" they say, "but the AR 15 round is too powerful, and can penetrate body armor". First, it's much lower power than any of the aforementioned hunting rounds I mentioned. The 223/5.56 is actually an intermediate power cartridge, developed because the .30-06 and later .308 were deemed not only too heavy, but too powerful when engaging targets at under 100 yards. The recoil was more punishing, slowing down follow-up shots, and the rounds overpenetrate (i.e. shoot through the "bad guy", through the innocent bystander behind them, another 200 yards, through the wall in the house down there and into the person sleeping in their bed). Oddly enough, overpenetration is not as big a deal in combat in a war zone, yet it was enough of an issue for the military to leave the hunting rounds for long-range shots and feeding machine guns like the M134. Using a hunting rifle in a home-defense situation guarantees patching multiple holes in walls, including your neighbors', even if you hit the bad guy(s) and praying nobody else was behind those walls. Live in an apartment? Fuggeduboudit. You are accountable for every round you shoot, even if the shooting is otherwise justified. That brings up the second issue, about penetrating body armor. Well, not all body armor is the same. However, when most folks talk about it, they are referring to soft "armor" inserted in a crossdraw vest or LBE that most police officers use. At best, they'll have a trauma plate behind that. Here's the deal: *any centerfire rifle round penetrates soft body armor*. No exceptions that I'm aware of, save perhaps the most limp-wristed (and probably 100+ years obsolete) low velocity rounds loaded with black powder and soft-point bullets. The velocity is too high for soft protection to stop. That level of protection is meant for pistol rounds only. Even 00 buckshot can on occasion get through.
"But" they'll then say, "all this yak of 'military this', 'combat that' makes my point! These are weapons of war!". So is the knife. And the bow and arrow. And the crossbow and bolt. And the slingshot. And the stick with one end chewed into a point. You cannot ban *this* gun but not *that* gun based on the notion that ... all guns are derived from weapons of war. Most bolt action rifles are variants of the Mauser, not only a weapon of war but a Nazi weapon of war (well, at one point in its service life). Almost all cartridges are military hand-me-downs to the civilian market. It's actually only very recently that cartridges have been developed outside of military contracts, owing to the free market. But their performance is not to be "mis"underestimated based on that. But on that note, the 2nd Amendment does say "the right to keep and bear arms", "arms" being the implements with which to wage war. That may sound scary that your neighbor has a "right" to "keep and bear implements with which to wage war", but the point was that the power to wage war should remain in the hands of the people generally, not monopolized by a professional Pretorian class. "No! The militia! And a well regulated one! Meaning, government needs to regulate them!" Well, the Founders defined the "militia" as all "able-bodied, fighting-age men", and "regulated" back then meant "well practiced", "put in good order". "Militia" did not mean "Soldier of Fortune" types, nor the National Guard, nor a national army. "Regulate" did not mean "government red-tape, permits and hurdles". That's the modern definition of the words. I understand folks like to use the definitions they're familiar with, but that's a bit like saying the Flintstone's theme song advocates homosexuality because of the lyrics "... we'll have a gay, old time!".
"But why do you neeeeeed an AK ... or an AR ... or anything else like that!?" Nobody does. Until they do. And that's the problem. You don't know if/when you ever will. And even if you do find yourself needing one, there's no telling that the circumstances will find it handy even if you own one or a hundred. Locked up in your safe at home as you're getting overrun by a violent rioting mob who will, in about 5 minutes, kill you and your family. But you weren't at home, you were on the road or at a friend's house when fate came a'knockin'. Maybe you have a 5 shot revolver. Good luck. Them's the breaks. That's life. However. On the bright side, the gun grabbers are right in one aspect: the odds of something like that are very low. Just as low as my apartment burning down. Yet I still have insurance. Just as low as me getting in a head-on collision. Probably lower, to be honest. Yet I still have insurance and air bags, and wear my seatbelt. Yet nobody gives me grief over taking care to do what I can for those contingencies. Maybe it's because nobody accuses me of wanting to feel macho by putting my seatbelt on as I fantasize about getting in a head-on collision. Or paying my insurance premium as I silently joy in imagining someone leaving a greasy pan unattended on a hot stove in the apartment next door. Which brings up motive...
I live in Texas, a border state. And I've had a few run-ins-by-proxy with cartel activity that is encroaching here. My bro-in-law worked for ICE a while back, and told me that where I live is a concentrated hotbed of cartel skin-running operations. They smuggle folks in across the border, and keep them hostage in rented homes here as they extort relatives and friends in the states for more money, usually while torturing the poor soul over the phone.
http://www.youtube.com/watch?v=Cfm8TgBL69Y
And it's spreading. A few months later a coworker told me that his wife was evacuated from her work, about a mile from where I live, as the office next door was raided by Dallas SWAT. Turns out it was a cartel drop-house where (mostly) young girls smuggled across were likewise held hostage at the muzzle of AK47s (the full-auto, Eastern European kind) until they either extorted more money or sold them into the sex slave trade. This was in Addison (for those familiar with the area). On the surface a pseudo-hip trendy douche-bag clubbing Mecca, under the surface ... well, what I just described. It's little bits here and there. But they're becoming more frequent. Fortunately not as frequent as in AZ, but nonetheless...
There's an old saying, "the right tool for the right job". For a single burgler busting in your home in the middle of the night, an AR is not the optimal response. Compared to a handgun, for instance, it's big, heavy, long ... all of which can become factors in the confines of a home or apartment. However, it's shorter, lighter, and easier to deploy than a bolt-action hunting rifle, and doesn't shoot a round that will go clean through 2 houses or 3 apartment units, plus all the people who might be in the path. But it is easier to aim than a handgun, especially under stress. A shotgun would be a bit better, in that buckshot isn't going to go on a never-ending journey through building and bodies. But it's still heavy and long. And the recoil - ouch. However, many home invasions involve more than one person. In that case, the bolt-action is out, and the shotgun is demoted (if pump action or semi-auto. If break-action, it's fired. As in Trump fired, not pull-the-trigger fired). When the assailants exceed one, an AR/AK/whatever-kinda-like-it comes to the top. Double that if the assailants are members of the Zeta cartel, wearing body armor and raiding a neighborhood. Yes. It happens. Yes. In 'Murica.
http://www.youtube.com/watch?v=-3MdjnY9-VA
I'll wind it down here ... if (whatever I have that looks scary to people) comes out for anything other than a day at the range or cleaning ... trust me. I neeeeeeed it. Because there'll be a war going on near me. Odds? Very. VERY. Low. But not zero.