The implication of what you're saying is that pathological liars and perpetual grifter snake oil salesmen types aren't intelligent.

> All it can do is get exposed to specific examples, and learn that we don't like that.

I've heard it said that prison rehabilitation programs for prisoners diagnosed with psychopathy that are based around exposing them empathy for the victim are counter-productive. Apparently programs that teach these people to think about the consequences of their actions and how they're detrimental to their own personal well-being lower recidivism rates in this particular kind of group.