While I can't speak to specifics on Sanger's views, diversity is leftism and if minorities (at least, the ones of lower quality) outbred whites, well then we'd have.... today?
Obviously, the Jesse Lee Petersons and Ben Carsons are exempt.
Leftists like abortion because they enjoy lowering standards and cheapening human life, and because religious people hate it. Many (such as doctors) make good money off it too. It also makes it easier for them to fuck without raising a kid, which IMO makes sense but they seem to enjoy the baby murder part regardless.
However, the religious nature of the abortion debate over the ethical one makes the right-wing sound ridiculous because of the poorly-defined reliance on abstractions. Clearly an abortion on the third trimester essentially is murder, but taking a pill the night after a good creampie really isn't. But the religious people will argue for stupid stuff such as being against the latter.
White democrats significantly have less children, you mean.
I shake my head every time a right-winger condemns Margaret Sanger for her wanting to lower the amount of minority births. Granted, I don't think aborting is all that ideal, but getting hood homies and sistas to have responsible sex is gonna be difficult.
Boomers see an R next to a name and that's all they care about. They think these people running are braver than they are, when in actuality they're equally cowardly.