I don't think I covered what they do about that, but my mind immediately went, "hold a funeral".
The extreme vegans have a peculiar logic of their own. If meat is murder, then meat-eaters are murderers, murderers should be punished with execution, therefore meat-eaters should be executed. Perfectly logical. Just... very specifically imperfect.
These are the people who would memorialise their own dead with tree graves, so there's lots of green spaces.
RE: Challenge #03044-H121: Unclean! Unclean!