If you and I are alike, we think of ourselves as morally superior to Adolf Hitler. We think it impossible that we could have done what he did. And yet, had we been born with the same genetic inheritance, raised in the same way, lived in the same era, and had the same experiences as he, it's not certain but it's very likely that we would have acted as he did, and most of the world would regard us as evil.
I think the word 'evil' shows a harsh judgment, one caused by our arrogant need to feel morally superior to others. The need to feel superior is the very same need that motivated Adolf. The difference between us and Adolf Hitler is that we were luckier at birth. We were mildly infected with arrogance. He was severely infected. (Psychologists use the fancy term malignant narcissism).
But evil is merely a perception. If we humans were to see sickness and not evil. We would think of quarantine and not punishment. Our conscience would then allow us to isolate dangerous people from the general population until they are no longer dangerous. For example, people who only fantasize about rape or child abuse are not dangerous; but those who actually commit such acts ought to be quarantined for life, even on a mild first offense, until an effective cure can be found. Child molesters might be confined in an adult-only town where they could live their lives normally but without access to children.
Violent offenders might be quarantined as well. A safer world is possible if we were to think of quarantine for dangerous sickness rather than punishment for evil