The region my family is from was directly ruled by "submit or perish" types (it was historically common in the marginal regions of Inner Asia). Plenty of rebellions, peasant revolts, and clan feuds have happened over the centuries.

Also, what you described is basically psudeoscience and veers very closely to eugenics (the study of how to arrange reproduction within a human population to increase the occurrence of heritable characteristics regarded as desirable)