4 ms·

i think eugenics has to have an external influence on the mating choice, rather than just pure self-selection (this external influence might be inorganic, like

• lmm 4y ago
  > It's a spectrum as well - not a binary choice. Some cultures prefer their children to marry within culture, and this expectation is set by the parents/grandparents etc; i consider this a form of eugenics, albeit mild and likely not harmful. That's more a case of dysgenics; it reduces genetic diversity which tends to make it easier for hereditary diseases etc. to appear (particularly if it results in a small dating pool e.g. immigrant communities in second countries). My back-of-the-envelope guess is that that tendency is probably doing more direct harm than anything else we might worry about (e.g. class segregation).