Comment by kelnos

Eh, not sure I buy that interpretation. Ensuring that the meat you eat only comes from ethical sources is hard, especially if you eat at restaurants, or if you eat food that other people have cooked. (Do you really want to be that person who goes to someone's house for dinner and on-the-spot refuses to eat because their host isn't sure of the provenance of the meat?) It can also be significantly more expensive. It would be entirely reasonable to decide to give up meat rather than deal with all that, if it matters to you.

And on top of that it does make a statement about one's values. Even if someone was ok with doing all that homework, they might want to give up meat as a form of protest against all the factory animal farming out there.