Earlier quoted context omitted.
The US has been under replacement fertility for less than 100 years, under four generations. On an evolutionary timescale this is nothing. It’s like dropping 100 thoroughbreds on a small island. Come back in 20 years and if there are still horses they’ll be maybe a hand shorter. Give it a hundred years and they’ll be ponies. If Mormons have higher fertility than non-Mormons then they’ll grow as a share of the populat…
> The US has been under replacement fertility for less than 100 years, under four generations. On an evolutionary timescale this is nothing. So? Human society and culture can change absurdly fast. If the evolutionary impulse to reproduce was that strong, you wouldn't be seeing places like Singapore with comically low birth rates. What evolution compels us to do is have sex. We've just disconnected that from reproduct…
It compels is to do everything we do in life. There isn't a single trait ever measured in which the heritability was zero.