That, or even that the son committed the murders but was under the influence of both drugs and some sort of brainwashing. There is that claim that you can't make a hypnotized person to do anything they don't want to do, but could you use something like hypnosis to escalate something that was already there - like maybe anger towards his parents - to the point where the person would do something they might not have done without that "push" to do it?

And who knows, that might be something used to create potentially useful assassins if there are individuals who know too much and just might decide to talk, or are suspected that they might, destroy some member of their family by drugs etc so that they could be used that way if it is seen as necessary. The lifestyles of people in those circles seem to be pretty bad for anybody who is born into those families, a lot of the children end up more or less messed up, but just as a speculation, maybe at least some of them get some sort of outside encouragement towards those lifestyles, and something like drug use. Which of course then means a lot of together time with all kinds of professionals whose presumed job is to help them, but could easily be used for other purposes too. Like programming them for something else?

Of course I have no proof of anything, again, just speculating based solely on how common those problems are for the children of the rich and famous, especially in Hollywood.