>You're looking for a physiological cause when the
>difficulty is with the twisted thinking.
But so many times there are physical manifestations of disease states.
Consider: Psoriasis is a dermatological manifestation of a systemic disease. A reliable predictor of a woman's sexual orientation and recptiveness to casual sex is the ratio of the second digit to the fourth digit. This is because finger length is related to exposure to androgens in the womb. Retina health is related to sleep efficiency and priming of the immune system. Finger length in males is related to schizophrenia. Fingerprint ridges have been related to autism.

>Sure, lots of sex offenders are overweight, but a lot of
>them are slender and not bad looking.
True. There may well be multiple factors.

>it isn't their physiological imperfections that makes them what
>they become but what they think they are in their own twisted minds.
No. Not 'make them' but perhaps 'influence them' or are evidence of some subtle influence that is as yet undiscovered.

>The twisted pattern of logic (and fantasy) develops early.
>However, while I don't believe this is the type of criminal
>that killed JonBenet,
No, the twisted thinkers you are referring to select a 'type' of person, but a man hunting a naked woman in the Alaskan wilderness would select just about any woman and would not write long notes to her about the hunt. He is not focusing on 'a person' and one victim would be just about interchangeable with any of his other victims.

>They choose to kill because it satisfies something in them.
Clearly.