So don't go calling it genocide, Holocaust, ethnic cleansing, forced euthanasia or eugenics --- just call it 'good housekeeping'.
When the scientists insist that reality can be reduced fundamentally down to a few simple motions by a few tiny atoms, why clutter up things by keeping unneeded Plans Bs, Cs, Ds, etc ?
Best to simplify and purify our gene pools - not diversify them --- that's what any good stockbroker would tell you : bet the entire farm by putting all your eggs in one basket.
Nonsense you say, this is all so untrue : we value biodiversity and always have !
Depending on your age, your grandparents and great-grandparents certainly didn't.
It is not all all true, or rather insufficiently true, that we have 'changed' since the war.
In fact, we did a complete 180 degree U-ie.
We went from exalting pure-breeds and pure-bloods and banning any form of mixed marriage to exalting biodiversity and lustily admiring pop stars and actors with those vaguely tawny brown skins that signal the offspring of mixed race marriages.
So Diverse Modernity, circa 1970s till who knows : doesn't know what the future holds and is unashamed in admitting that.
So, best to to keep all options open : Plans B,C,D,E,F,G, bring 'em on - the more the merrier.....