In short, we re nice people. The irony of much of human behavior is that we often hold in contempt the qualities in others which we have espoused intellectually as virtues. The peacemaker is a wuss. The accumulator of wealth is so revered that the sharer or giver evokes fears of poverty. The non-rebellious person is regarded as a dumping ground for the chores avoided by ambitious frontal folks.
Schools point right basal children toward left basal skill sets, especially if they are boys.
The girls may be allowed to pursue their gifts but not to expect exceptional admiration nor reward. The right basal child is the one most likely to put himself through hoops to calm the dysfunctional family. He or she is likely to falsify lead to become the model of the good kid to keep peace. Given the greater average earnings for left-brained skills and the higher cultural approval, the basal right child often winds up pursuing a career which, though honorable, neglects to use his greatest gifts to advantage. In a society where coin of the realm is also the score card by which regard for contribution is toted, builders of barns are better paid than builders of brains.