"at his base at Nitzanim saying: "I cannot be part of an organization that expels Jews."
Well that part of his thinking was rational. The rest of the analysis is somewhat meaningless because as the writer points out, he is a rare exception and not the rule, so the sample size for analysis is pretty tiny. That being said, my opinion is that terrorism is murder and that if we as Americans saw a guy shooting us on a plane, your damn right we would beat him to death. Palestinians including police do not have instillment of law and justice systems. It simply has not existed in their culture. I not agree that this man helped the situation. Nor do I think he really hurt it either.
After he was handcuffed? In general I don't think so, though it would be situational. And we still don't know what happened here. In any event, those who killed him would be charged, as I suspect they will in Israel, if identifiable.