There's a stream that trickles through all of us. It's always there. It's evil and we know this, so we force it to mix with the larger river inside us. We let it be consumed by the greater flow of good. But when the good in the river runs dry and there isn't enough of it to dilute the stream, then the stream flows faster and harder, uncontrolled, and it finally floods one life, then another, then another. And it's always the innocent who are easiest to pull down. It's always the innocent who are standing there on the banks and looking in, curious and trusting and sometimes, maybe, even a little brave.
T. Jefferson Parker, Where Serpents Lie
child-killer, evil, serial-killers