Cats are carnivores, cows are herbivores, humans are omnivores (we have the option to do what we like!). Can you explain why we must all evolve into herbivores from a first principles perspective? Let each person choose the option they desire no? Maybe in a world of non broken money so much meat wouldn't be converted into highly processed addictive crap and a return to high quality diet would address your concerns. Humans will always be omnivorous though, I wouldn't stay mad at that.
