> Some vegans do it because raising livestock is unsustainable. There is not enough land on earth for everyone to have a meat diet.

I'm dubious about this statement. There is a lot of ocean, so seafood farming is probably quite capable of feeding humans meat. In addition, western societies currently overconsume meat. I suspect that if calorically balanced levels of consumption were observed, we probably have plenty of land.

> Some vegans do it because it's healthier. In general you can expect to ingest less toxins by eating lower on the food chain.

I see a lot of vegans eating far less healthy diets than those of carnivores. They up the oil and carb content quite significantly to make things taste better/create satiety.

I find that vegetarians (and even those who just back off on meat) seem to eat healthier than vegans, in general.