There is no way to purify a polluted gene pool. There is no means of self determination but violence. No other people have or can produce a high trust society. Only the east asians have produced higher neoteny. And they still did not obtain our verbal ability.
Either pay the high cost of self determination or pay the price of extinction.
https://www.quora.com/Many-people-agree-that-Europeans-have-through-thousands-of-years-of-selection-amassed-a-huge-store-of-genetic-wealth-which-now-looks-in-danger-Is-it-feasible-to-try-to-harvest-and-preserve-it-artificially-as-a-large