Actually, the student I described was highly intelligent, and that was one of the things which made me want to help him, knowing his home situation.
I really don't think there is much correlation between intelligence and the sociopathic mentality, but I could be wrong. I have known some highly intelligent men who behaved without conscience.
The stalker character I wrote about here, however, probably WAS retarded to a degree, while having learned to be very streetsmart.
Seeker