[iammjm]

I like the point about not doing a terrible thing not being enough if I am passively tolerating other people doing terrible things around me. We are all complicit by either active participation in evil or by inaction. Factory farming is evil, there's no argument about that. And it's industrial-scale evil: billions of conscious creatures living their worst possible lives. And there is no argument about them being conscious too: anybody who's ever owned a pet knows that these creatures have rich emotional lives, personalities, fears and joys. And it's not a necessary evil too - there is plenty of protein and calories without meat.