The anti-abortion sentiment is very tightly bound up in the white nationalist / supremacist narrative. A lot of the same folks who say they want to ban women from having abortions are the same ones who endorse sterilizations, harden their hearts toward public healthcare for minorities, and scream all the live-long-day about Anchor Babies.

The theory of the anti-abortion activist is always that the wrong fetuses are getting terminated. This ties back to old blood libels against Jews, Satanic Panics, and other conspiracy theories that orbit the "Great Replacement" Theory of lower-than-average white replacement level procreation.

And in the last decade, as domestic maternity rates have fallen and hysteria around Arabs, Latinos, Africans, and the Dreaded China Menace has peaked, we're seen a lot more Scientific Racism that gears itself around the need for a revitalization of the White Race as a prelude to some kind of future apocalyptic global struggle for power.

Also, desperate, neglected, unwanted children have less of a chance of going to college and pursuing "better" career opportunities later in life. Theres just too much stress associated with the simple act of living. They'll always have to rely on the state for assistance, which means they'll always be driven to work the jobs no one wants for a pittance, just to be able to survive.

Make no mistake, the anti abortion politicians aren't doing this out of any "respect for life" or whatever, they just want to keep the working class populated, so they can keep making money off the backs of an uneducated, exploited population.

*anti-abortion

But also those same people would like orphans to be raised by private Christian organizations (and limit adoption to Christian nuclear families), so I would say they would also like those children to be raised Christian to reinforce their religious theocracy

I'm pretty sure that is one of the biggest reasons for Republicans to be anti abortion.