^ Trump was likely talking about ISIS or Al-Qaeda there. Not saying I agree with his remarks, but it's not comparable to Hitler, who targeted the old, the very young, the sick, the disabled, and the jews, none of which were terrorists.
He says, repeatedly that he wants to kill their families. Unless you somehow think women and children deserve to be killed for who who they were married to, or who their parents were, or that parents should be killed for the actions of their children, he is indeed advocating targeting the old and the very young. He talks about Muslims much like Hitler spoke of Jews. He also mocks the disabled, and is doing his damnedest to talk proper medical care away from the sick.
While, again, I do not think he is marching in lockstep with Hitler, remember too that it took Hitler and the Nazis years to go from racism to ethnic cleansing to mass extermination. We've only had six months of Trump. (And will hopefully have given him the boot soon enough.)
Trump really isn't any worse at killing people than Obama or Bush.