This interview with a pedophiles daughter is worth a look, it's a good insight into the mind and actions of a pedophile (note where he went to carry on his crimes). This excerpt rang bells for me:
Did anyone else in his life realize what was going on?
Nope. Well, not that I’m aware of. He’s extremely smart, handsome, and charismatic. But he’s also a classic psychopath. He lacks all ability to empathize with other humans, and once you get past the charming veneer, you realize that the only way to have any kind of relationship with him is if you allow him to control you. There is zero dissidence allowed - which is why he has almost no friends. His carefully curated circle of adorers only see one very small part of what he really is.
http://www.yesandyes.org/2013/06/true-s ... phile.html