"I don't know the science behind it." Applies to his every claim.

He’s the way he is because of how they treated Rose. He’s almost guaranteed to be ADHD, maybe ASD too. The psychologists at the time didn’t really recognize it until the 1960s, and that wouldn’t mean widespread acceptance of the idea. Before that they called it something else entirely, and the common use of drugs like Ritalin and Adderall for ADHD didn’t happen until the ‘80s even though they existed far earlier.

So this dude was shipped off to boarding schools because he’s a “problem child” and a Kennedy. He was uncontrollable in schools, couldn’t stick to anything, got kicked out of boarding schools, and the only reason any of the schools put up with his shit at all was because he was a Kennedy. Got into drugs because that can happen to untreated ADHD people and people who have f’d up home lives. All this was swept under the rug by the Kennedys because they didn’t want the press to get wind of another Kennedy with “mental problems” and a drug problem. So he went untreated and unhelped. The worst thing that could happen to him was that he was born a Kennedy.