Hitler wasn't God, but he did the same thing that you just talked about. Who gave him the right to kill people off in either situation? Hitter viewed Jews imperfect because of their religion. Germany and Eastern Europe were very heavily catholic, and so they blamed a separate religion for all of their problems. God viewed the "evil" people as inferior to Noah, otherwise he wouldn't have saved Noah. Noah was better, therefore superior, to the rest of the world.