"if annihilationism is true, this is wonderful news for the Hitler's and Stalin's of this world. They can kill millions of people in life and then at the end, apart from a few moments of shame at the judgment, they actually get away with it. Once annihilated, they will never have to think about their sin ever again. In fact, they will never have to think; and never have to worry; and never have to grieve over their sin. .... so likewise this would be the case for the mass murderers of the world.
No, the biblical picture is very different and I would say extremely clear. Most of our information about hell comes from the lips of Jesus, who is of course, the highest possible authority. It is as if God, knowing that men would rail against the doctrine of hell, did not entrust the bulk of the message to even the most prominent of the Apostles, because He knew men would say, "Oh that's just Paul going off on a tangent." or "yes, Peter was a child of his day and it was popular to believe in hell at that time, hence he warned folk about it. We know better." Of course, this idea totally undermines the inspiration of Scripture, for although all men can be misguided, God preserved His Word with inerrancy." (John Samson)