We use one to stay alive and the other to bet on.
Boom.
GTFO of my face.
Grade: F
Not only did you not adequately explain the difference, but you've now confused the issue even further. Because now you have to explain to the alien why we will allow other sport where we abuse, but bet on animals - such as horse racing. In addition, you have to explain why dog fighting continues to be abhorrent even if we were to eat the meat after, and you have to explain why we are "staying alive" off the suffering of animals when we have other options. Try again.