Veganism represents a denial of who we are as a species, as if 2.6 million years of our evolution as obligate carnivores can be reversed because of the invention of the internet. It falls in with "You are what you identify as, no one can tell you that just because you are born XY you can't decide overnight to be as XX as you please."
Beliefs are always trumped by biology, and the whole vegan house of cards is crumbling away under the weight of reality.