A relative who works with the criminally insane has told me that most of his case histories can trace this back to early childhood. He thinks that most of these kids are MADE into the bad adults by the type of feedback mechanism between adults and their kids described in the article.
One thing the article does not bring up is how dangerous it is for psychologists to work with them.
It's also dangerous to the foster families who take them in who have no clue about what they are getting.
There are some absolutely disgusting stories I could tell.