How quickly does the gene pool deteriorate when the weak survive?

How bad is our gene pool in the west where the weak have as many
children as the strong? I look at the British royal family for example.
They are quite ugly and not that bright.
Does low intelligence, ugliness, bad teeth, etc become prevalent very
quickly. When you look at animals, sometimes 80 percent die off in a
bad winter leaving only those with good genes. At some point, wont we
have to start doing managing genetics. Was Hitler right on this point?
Churchill , as well?


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