In the beginning of the human race there was no genetic load which would cause undesirable traits such as appear in offspring of marriages between relatives today. ↗
School divides life into two segments, which are increasingly of comparable length. As much as anything else, schooling implies custodial care for persons who are declared undesirable elsewhere by the simple fact that a school has been built to serve them. ↗
Right discipline consists, not in external compulsion, but in the habits of mind which lead spontaneously to desirable rather than undesirable activities. ↗
If we know anything about man, it's that he's not pacific. The temptation to butcher anyone considered undesirable seems to be a common temptation, not always resisted. ↗