I'm not vegan, I eat meat. I ask for evidence because you're clearly biased and using emotionally charged and unscientific language when you dismiss the vegan diet. So I don't believe you have a real understanding of the science or potential nutritional complications.
Don't bother replying with "it's just common sense" reworded for a third time. If you can't provide evidence, that's fine, but you don't need to keep going on your dramatic crusade against something you don't understand in the comments. I'm not asking for your opinion.