Allow me to share an idea. It is as close to wisdom as I have ever come. A realization I had, once upon a time, while thinking about good, evil, the nature of sin and what 'good' is.
It's quite simple, really. All evil, all sin, breaks down to two words. The seven deadly sins? Nope, just two: Selfishness, and Ignorance.
Whenever you hear of something wrong, criminal, vicious or evil, you can break down the act or the words down to their root and find Selfishness, Ignorance or the two together. Everything negative in the world that Man has perpetrated against Man, it all comes down to being selfish or ignorant or both.
Two sins, working hand in hand in our hearts and minds. Two sins that only become unforgiveable when they are willful. Everyone has moments when they are selfish or ignorant, when they unthinkingly do something vicious or stupid. But when someone consistently chooses the selfish, ignorant path, they make themselves a threat to the rest of our species.
All the Evil I have ever witnessed, just humans being selfish and ignorant. Refusing to care about others, refusing to think and ask and question. Selfish. Ignorant. All our problems revolve around those two words. Small minds unwilling or unable to do more than obey, to do more than think of themselves.
Simple, really. Isn't it?