Eugenics, the central science of Modernity, was a form of Reductionism and Plenticide.
Eugenics was all about reducing the existing 'impurities' it felt were present in the gene pool : like all of Modernity's sciences, it thought reality - in this case represented by the gene pool - would work much better if only it was much simpler.
But today's scientists generally seek to increase, enlarge, deepen, diversify the gene pool : they fear keeping all of our survival eggs in one small, shallow, inbreed, genetic basket.
Today's scientists have come to see that reality is inherently and permanently complex rather than being something that seems (temporarily) to be complex but really is fundamentally simple and simplifiable.
Now they see that human and planetary survival depends on having many, many possible solutions readily available to meet many, many possible problems.
So plentitude - 'the more the merrier' is their cry - not reductionist plenticide, genocide and euthanasia.