Another intersection of many things discussed here, but military families are more likely to have more kids (about 1 full child more than other married families) and thus more likely to have YUUUUUGGGGGEEEE families as well, because of clustering effects. Turns out a map of fourth births or higher has a bunch of the births happening near clusters of military presence even when there is no major metro nearby. They don’t have all the fourth, fifth and tenth babies, but they have a huge chunk of them compared to the general population.
This also explains the relentless homeschool promotion since in that circumstance it often does make sense.
It explains the small biz/entrepreneurial mindset because you have this pool of people with PRIVATE INCOME AT AGE 40 giving advice about being “your own boss” to civilians.
Since the massive base closures of the 1990s, military bases are far more isolated from town than they used to be. So there’s a closed loop effect.
Also, on base housing, you can have kids run around a heck of a lot more and of course walk to the commissary, which, you know, sells most of what you need to live. So there’s a very distorted idea of what letting the kids run around really means, and that this kind of housing is not an option off-base.
And then there’s the fact that all this played out in the 1970s on, because the volunteer army started then, so there’s heavy selection bias.
While the military as a whole is slightly less religious than the general population, that’s driven by the high single-guy numbers.
And the military provides a lot of benefits that aren’t cash in hand (but sometimes are totally cash in hand, like hazard pay and bonuses) but which make living on the not-great pay a lot easier than the equivalent money in civilian world. It also makes a lot of advice given by people who spent most of their child-having years in that environment of limited utility if they don’t actually say “but you’d need like twice the pay to do the same as a civilian of course”.
So you have a population that is a very tiny, very self-selecting slice of America punching way above their demographic weight in baby-having, which means there’s a disproportionate share of children of theirs running around and how those kids are reared exercises a disproportionate impact on the rest of the population, especially the conservative Christian one because their moms are very isolated except for internet and religious activities.