Vegans aren't necessarily bad, but the way they act and how they practice are bad.

#1: We are carnivorous animals.

Doesn't matter if you want to save the ecosystem, we eat meat. It's a fact. It's an essential in our bodies. You are making your self more prone to death if you don't eat protein.

#2: Toxicity

Yes, vegans are toxic and attack everything that goes against their policies.

Well, most of them at least. (look at PETA for an example.)