Not really to be honest. Rational person would know that you can't force someone to like you. Forcing 'friendship' looks more like something an autistic would do.
> he was very rational and threatened other children to play with him and treat him like a friend
My emphasis. He’s not forcing people like him, because you’re right, you can’t force that, he’s coercing people into acting like they like him.
The point is that since he (supposedly) can’t feel the feeling himself, or can’t understand it, all he has to go off of is what he observes - i.e. the behavior - and you can absolutely force a behavior.
I mean come on, there are plenty of adults who think that that's a perfectly rational approach to getting what they want.
True, but TBF, it takes experience to realize that, and the psychopathy kind of hinders getting that experience? (Reading could also help, but not in the same way)