Heaven is a state of oneness with God, heaven is everywhere, so is hell. People in hell are incapable of relationships, they are alone, they have made themselves their true center, which is a lie, since only God is the true center. If Hitler is in heaven that state of being of being one with God, then he is one with all. In order to do that all that he did to others has to be experienced by him. All the pain etc., has to be gone through, it is the only way. For in that, which is mercy, we learn that what we do to others is in reality done to ourselves, to Christ, to God. God's judgement is the simple truth, the way things are, both the soul and God agree with the judgement. It is impossible for a person to be in hell who does not belong.