Making incompetent sociopaths more rational would create new harms as well. They would be better able to fool people and erode the trustworthiness of "normal-seeming people" a little. But since there are already many competent sociopaths, and because normal people are situationally also selfishly destructive (self-serving bias+hypocrisy), we have institutions that mitigate those harms.

That sounds right to me. I suspect the main difference that improving social education for all children would have on sociopaths is that it would knock some of the rough edges off the less intelligent among them. The kind of behaviours that are maladaptive even for sociopaths and may lead them to do overtly anti-social things and wind up sanctioned.

But since there are already many competent sociopaths, and because normal people are situationally also selfishly destructive (self-serving bias+hypocrisy), we have institutions that mitigate those harms.

The models I have for competent sociopaths and high status individuals are approximately identical for basically this reason.