I believe the one common thing that Jesus Christ, the Prophet Muhammad, Baal Shem Tov, Karl Marx, Adolf Hitler, etc have taught society after their deaths is that you can kill people, but you can't kill ideals. The world is (and always will be?) full of Christians, Hasidic Jews, Communists, Nazis, and Islamic militants no matter how many members of those groups are killed in a dispute. Say for example, we were to nuke the entire middle east with the consent of other countries--including China (this is an example!). Who's to stop the few survivors who were born in that region from secretly forming an organization with an interest on vengeance and killing in the name of god? You'll get the same damn thing over and over again.