The average isn't as important (except "on average", I guess) as the extreme lows dragging everyone else down and the extreme highs trying to hold things together and build an oasis of civilization. And with enough lows then the highs can't really do anything beyond getting as much build wealth as possible to build little forts for their families. This isn't related to your argument about importing high IQ foreigners. Just an observation.
The average isn't as important (except "on average", I guess) as the extreme lows dragging everyone else down and the extreme highs trying to hold things together and build an oasis of civilization. And with enough lows then the highs can't really do anything beyond getting as much build wealth as possible to build little forts for their families. This isn't related to your argument about importing high IQ foreigners. Just an observation.