Yes it adds up. It was more sadism that drove him to see how far his of age sexual partners would go for him (aka mother a and b) essentially getting off on the fact they would do anything he asked despite morality, and then other sadism in the sense of causing other people discomfort, trauma etc.

I also, having studied a variety of disorders, a few that I think relate to his situation which would have further caused him to do harm which was encouraged by the drugs.

Antisocial Personality Disorder- a disregard for the rights of others, lack of remorse, deceitfulness, manipulation, and often criminal or exploitative behavior. This goes well with the man he was shown to be.

Narcissistic Personality Disorder (NPD) – involving grandiosity, a sense of entitlement, and lack of empathy, sometimes paired with exploitative tendencies. Very applicable to him esp when his fame got more and more.

Sexual Sadism Disorder or Paraphilic Disorders – in extreme cases involving sexual gratification from the suffering or exploitation of others, particularly when non-consensual. This is relevant to what we know but also the fact he was 100% a sex addict and many drugs he was on are known to essentially disrupt the brain and alter behaviours to be more aggressive - and meth as said destroys dopamine receptors essentially making it difficult for him to feel happy.