He has to have killed several women, both before and after Natalee, and had his family shield him each time. He probably loses control of his emotions and impulses, and gets wrapped up in the moment, knowing that he has always gotten away with it. I think now he’s coming to grips with the fact that he’s on his own now, and there is no daddy coming to pull his nuts out of the fire.
Can you imagine what he probably got away with during his years in Asia?