Good people without restraint do horrible things. All have sinned and are fallen short of Godliness. When we learn this, we can be saved by monitoring one another and by submitting ourselves to each other. Whenever anyone is above the law, especially the law, we end up with horrors manifold and repetitive.
As a soldier I have seen people with guns and no control conceive and carry out horrible things. If we do not submit ourselves one to another in the fear of God, we are horribly ignorant of our own fallen state.