I think you make a valid point. If I were to guess, based upon what I have noticed over the years, it is the low-class, low-intelligent people who are producing the most children. High-intelligent people, as a rule, don't have a lot of children; there are exceptions, of course (Tax-Chick would be one of those exceptions).
Unlike our current Pres__ent, I (and my FReepless husband) have the test scores and transcripts to prove our intelligence ;-). And several other FReepers have more children than we do, to the great benefit of the nation.
Nonetheless, it was not poor people with a dozen children who enacted socialism, anywhere. It was wealthy ideologues with small families - Roosevelts, Rockefellers, Fords - the equivalent of today’s Friedman and Attenborough and Ted Turner. Their goal was not to help, but to take control.
That is also the goal of “environmentalists”: to control. “Green” on the outside, red on the inside. If they can get freedom-loving Americans to buy into “Just enough of me, way too much of you,” instead of “Way too little freedom, way too much government,” then they win and everyone loses.