A question for Christians?

As Christians we are taught to go down the path of reformation not retribution but God is it hard sometimes, especially in circumstances that you have just said. I think people like Hitler and Jack the Ripper got what was coming to them. They'll spend eternity in hell, but remember what we could have done to them, would not be anywhere near as bad as what God can do to them so yes there is a God in my opinion and he would have dealt with these people when the time came.