This is not really true. It is more a matter of people not being taught how to reason and think critically, not that modern people are somehow genetically inferior. People need to be taught better, but most spend their formative years being taught outright lies about pretty much everything and taught to emotionally react and not reason
Education and intelligence aren't the same thing. People are more educated and have more access to knowledge than ever before, yet psychometrics shows average IQ decline every generation for several decades now on g.
Two different (but not totally independent) issues. The dysgenic trend in fertility is an empirical fact, as is the increasing prevalence of mutant genes.
People don't understand the problem of dysgenic fertility because it's unintuitive exponential change, like mass immigration. Suppose you start with two equally sized populations of 1 million each. Population A has a fertility rate of 1.5 and B has 2.5. After 200 years, say 7 generations, population A is down to 130 thousand and population B is up to 4.8 millions.
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