Shall we ban any belief then? Because I can tell millions upon millions were murdered by so called communists from Stalin to Phol Pots killing fields you are forgetting that human beings will do terrible things in the name of what they believe people have even been murdered for supporting the wrong football team
Your on the money Ducado , even if the world consisted of nihilists without any appetite for destruction , human beings would still find a way to inflict pain , misery and or destruction on others.
You would have to find a way from stopping all thought from man to begin the path to cease this type of behaviour.
When they cannot find motivation for that they focus on doing likewise on flora and fauna.