I think a lot of psychopaths are just geniuses who drove so fast that they lost control.
The Christian does not avoid sin to achieve salvation, but rather salvation brings him to a desire not to sin. The closer that one's spirit is synchronized with the holy knowledge of God, the more he comprehends how and why sin is destructive to himself and others in each and every circumstance. The dwindling desire for sin is a premature gift of Heaven - where there will be no sin, where all will, too, possess that full and complete wisdom; all will have perfect reasons not to sin. In this way, free will might still exist, but the shared wisdom of God will simply outwit all desires, impulses, and needs to sin.
Self-righteousness is much like a spiritual egocentricity. It constitutes a secular type of love that thrives under conditionality, one in which is only existent after an individual meets the adopted standards of the condemner; oppositely, unconditional love is a holy love.
For God to prove himself on demand, physically, would be a grave disappointment, and the strongest Christians should be considerably grateful that he chooses not to do so. The skeptic endlessly demands proof, yet God refuses to insult the true intelligence of man, the '6th sense', the chief quality, the acumen which distinguishes man from the rest of creation, faith.