I don't understand it.
For most of the evil I see being committed around me, they are usually totally unnecessary. If one had stayed honest and true, and not overcome by stupid greed, everything would be fine.
Unfortunately, here we are. And even bigger evil is done if these are allowed to fester.
All one can do, though, is to protect one's self and whenever possible, to stop evil from happening.
It's nice to know that with one well-placed word, evil can be stopped.
