Why are people like this?

the thread title is Why are people like this... its gonna involve a lot of depravity.... you take the info at face value and continue the question, why are people like this?
when people like this infiltrate positions of trust, escpecially trust of our children, they are the sickest of the sick.. and in a time when too many people worry about a man in dress reading books to children, these kind of articles need to be shown even more..