I've been in discussions with vegans over the 9.1x10^2 to 1.3x10^8 bacteria in the average indoor m^3 of air.
Orcas that enjoy playing with their food. Lions that eat prey alive. Beautiful and terrifying. Our primate and hominid ancestors that ate the flesh of rival clans.
I respect veganism and personal choices, but the world is a big place with lots going on that will forever escape our ability to control. That's how I frame my own decision, but I respect others' too.