Veganism protects animals, other humans and the world we live in. It's a very practical display of ethics and has far reaching moral consequences for such a small action. It's being the light you wish to see.
We are also all different. Veganism is so big now there are the ascetics and the hedonistic, the religious and the atheist, and everything in between. There are those of us who smell like a Grateful Dead concert or Bonaroo, and those who work in high fashion or in tech.
The main rule of veganism is thou shall not kill. Sure some vegans are more sustainable than others but most of us are automatically more sustainable than meat eaters. Veganism isn't the most you can do it's the least.
And LOL at giving a Virginia based animal rights organization run by a 70 year old so much power. You'd eat animals just to spite an elderly ENFP? That's the dumbest thing I think I've ever heard. McDonald's has far more capital and intention to brainwash children than PETA.