Is "warrior" the worst metaphor for a believer in peace or justice?

Saw this recently: I commented, Fuck no! Warriors make war: they kill, destroy, and conquer. We could use a better metaphor. The poster replied, warrior for peace and love. I replied, That's like saying "Be a torturer for tolerance" or "Be an assassin for antiviolence." If the discussion continues, I'll make this point and then, I hope, drop out: If metaphors matter, that one is awful.