1) What if you had a brother with an IQ of 98. Would you rather he had a respectable factory job, or become homeless?
2) Are you aware that many of the least-tradable services are the least "cognitively demanding"? So I guess you want to tailor the bell curve of the population so that everyone is either > 120 so that they can do very highly cognitive work, or < 80 (so that they are content doing extremely menial work). Isn't it a little inconvenient that around 68% of the population is 85-115 IQ?