I think it all comes back to the fucking Diet Police: everyone thinks they know best how other people should eat. Well, that's stupid as hell. Don't you have more important things to be angry about than Relayer choosing the seitan bacon over the dead pig?
Though within this thread we have an equal number of meat eaters and non-meat-eaters getting morally righteous about their dietary choice.
Personally each to their own. The "sanctity of life" argument's never held for me, because plants are alive too. Though it's just that arbitrary line that you're talking about.
Unfortunately I do have a negative view of veganism because the extreme of it just seems over the top to me and the only vegans I've met are the arrogant condescending type... but of course not everybody's like that.