Did that for years, ruined both my health and teeth. No thanks.
Because from what I understand, most vegans do eat at least some meat and animal products once in a while. "Breaking vegan" they call it. And it's OK to do it as long as you're vegan, otherwise it's not right and you're a murderer.
Because only being vegan is an ethical stance. Where being vegan of course means posting vegan memes on twitter and stuff like that.