Whats with the vegan propaganda?

_Not_ saying that i dont want to see it posted here!

I just want to respond in kind. They bring blantant nonsense one sided propaganda with links to another subreddit. When i enhance my argument with colorfull language to point out their impoliteness of just barging in with their radical, fragmenting agenda, i get shut down for not having an argument, which is a false accusation, my argument being that it is perfectly possible to eat ethical meat.

Why must i answer with level headed 'philosophical argument' to radical propaganda?