Ted Bundy worked volunteer at a crisis hotline

[Anton Chigurh]

I don't know that we'll ever have a full answer to that. Certainly there are numerous sociopaths who do not get up to serial killing, or even killing period, maybe because they have parents who catch it early, or it's just not the bent that there mental problems take.

Many of them go undetected their entire lives. Many more might not kill, but they become child predators,etc.

The ones caught and identified? Are teaching us a great deal, through study of them.