How many people did Karl Marx kill and how many have been killed advancing Marxism? Same question for Nietzsche?
Why would Karl Marx have to take responsibility for the murders Stalin committed? Both followed idiotic ideologies, no doubt, but the point that Karl Marx could not believe that there could be a God, in no way makes him responsible for the killings that Stalin ordered, to further his political ambitions.
The Conquistadors killed in the name of Christ, too.
It’s like blaming the gun, and not the one who squeezed its trigger.