[logicchains]

>Isolation is one of the main challenges faced by gifted individuals, especially those with no social network of gifted peers. In order to gain popularity, gifted children will often try to hide their abilities to win social approval.

That seems to suggest the cause of the problem is a lack of high IQ individuals. If the majority had a high IQ due to IA, nobody would feel isolated by their high IQ (although then the low IQ minority might feel isolated).