No Ana all the research over many years and in different countries has found that abusers were abused and/or neglected themselves, but with this level of corruption, stories of targeting disabled and vulnerable children, his alleged interest in necrophilia, and the sheer investment in his abusive lifestyle, any professional involved in the treatment of sex offenders would say the same - this was a man whose earlier years must have been highly sexualised and distorted to the extent that he normalised sexual abuse, never settled into an intimate relationship that lasted, gravitated to children/teenagers, groomed everyone around him to accept his bizarre behaviour, and was able to separate children from their carers and the authorities.
Imagine any of us trying to take children away without being challenged. He clearly had no empathy for his victims, something we all usually develop in a nurturing, loving family home. I wonder what prevented him developing empathy, and would guess its because he was corrupted.