Quote (Black XistenZ @ Dec 7 2021 10:38pm)
If intelligence is heritable to a non-negligible degree, which afaik is the current state of science, how can differential birth rates between groups of different intelligence not have this effect?
If intelligence was just random fluctuation around the same baseline, such that we could expect reversion to the mean to eat up all the difference that existed in the parent generation, then intelligence wouldn't be heritable to begin with.
Also, it's not just about intelligence, it's also about upbringing, education, manners, mores, culture. On average, parents from the professional class will raise their children better than trailer park trash or ghetto thugs. Their children will , on average, use whatever potential they are born with to a greater degree than children raised in highly suboptimal conditions. When people who could provide perfect conditions for raising productive members of society decide to go childless instead, a ton of potential is squandered.
Intelligence is heritable, but that doesn't mean it's genetic, and even if it is genetic that doesn't speak at all to the prevalence of gene combinations that produce higher intelligence in the general population.
Heritability just means "passes from one generation to the next". Doesn't mean "Genetically heritable". Living conditions are heritable, tendency to have piercings is heritable, etc. etc.
To have a dysgenic effect you would have to show that the current breeding patterns result in propagation of disadvantageous gene combinations, which has never been anywhere close to demonstrated. The current state of the literature is that upbringing has a much higher impact on intelligence. You can move your intelligence by like a full standard deviation by just being on an empty stomach and having money trouble.