Free speech means we have to let people be assholes, sometimes.
And, “there are assholes halfway around the world” is not sufficient justification for murder.
You can say, “gee, I wish there were fewer assholes.” And you can even say, “I wish the assholes would be less assholistic.” In private life (rather than civic life), you can discourage assholism.
But what you can’t say is, “assholism is a justification for homicide.”
Because the only thing worse than putting the assholes in charge of public discourse is putting the murderers in charge of public discourse.
UPDATE: Bruce gets it right.