What is the evil of human nature?
It was the murderer who witnessed the murder and chose to hide it for fear of retaliation.
I say I love you, but I raise my hands and hit you hard until you die.
It's forcing you to do something you know you don't want to do that ultimately leads to your death.
There is no specific explanation for what evil is. Only when you are on the edge of evil can you know what evil is.
Concept: The origin of all evil