Vegan

I wouldn't say "most." I just think the loudest voices are the assholes, and that applies to every group across all ideologies. That's not unique to vegans, but so much industry is built on suffering and has deficated time and effort to painting all vegans with the same brush. And it's not just animal suffering. Every capitalist knows, and fears, that if consumers begin caring about animal rights, human rights are a natural extension.