Well we kill it for pleasure, to eat them and treat them horribly, and almost absolutely nobody ever bats an eye. Folks that visit slaughterhouse often don't eat meat for few weeks but then revert back. Don't expect miracles, humans are mostly still pretty primitive species driven largely by emotions which swing semi randomly, all wars are, if you drill deep enough caused by this and only this. Or check any elections.

One day, maybe not so long in future as many may think, our descendants will judge us as primitive barbaric savages. And they will be mostly right.