The distance between evil and sickness

Like sin, crime that is a gross violation of human rights almost always hides its true nature from its own self. It is by its very nature delusional: perpetrators of human rights violations redefine morality and start believing that they can commit systematic murder and other atrocities 'for the greater good.' The distance between evil and sickness is not that great. The evil component of crimes against humanity is the moral failing. The sickness aspect is the defect in perspective, the distortion in mental processing that both precedes the evil and is intensified by it.