I don't follow the first part of your post.
Dick and Jane have sex. Jane gets pregnant, and tells Dick. Dick says he won't help raise the kid, and that he's dead-beat broke. Dick leaves to go to another woman.
Jane goes to the abortion clinic, and has an abortion when the fetus is smaller and simpler than the lab rats the drugs she is given were tested on. She goes and eats a hamburger afterwards, taken from a cow that was also much, much, much smarter than her fetus.
Jane meets Bob. Bob is a nicer guy, although not as sexy as Dick. Jane and Bob get married. It takes a little longer, but eventually Jane gets pregant, and has a child, Sue, who will grow up to be a happy little girl in a loving family.
In a religious dictatorship to the South, Jane2 has sex with Dick2. Dick2 is a dick, and Jane2 wants an abortion. But she can't have one, because the religious dictatorship means that she has no control over a tiny parasitic lifeform inside her body. But, she's free to drink away her sorrows at the local bar, subjecting the fetus to damage from ethanol.
Jane2 is pregnant, and eventually is forced to give birth to Bill, who she does not love. Jane2 treats Bill like the whiny burden he is, and tries to scrape by working at the local MegaMart while raising Bill in a trailer. One day, Jane2 meets Bob2, a nice guy. Alas, Bob2 dumps her the moment he learns that Jane2 has another man's baby, because he does not want to work to take care of another man's child. Plus, the kid is kind of a drag, and Bob2 can't take Jane2 out to the local bars all night and then back to his place to have sex, because she doesn't want to leave Bill alone. Bob2 leaves to look for another woman.
In the long run, Jane and Jane2 have the
same number of children. Sue grows up to be a happy idealistic pediatrician serving the underserved in Boston. Bill gets used to crime, as he resents how the world treats him, and goes on to become a competent drug dealer until he is eventually caught and imprisoned.
Thus, for every child who is aborted (20 million or whatever), sufficient ecological space for a new child is created. Abortion gives women the ability to
massively increase the odds that a child becomes "Sue" rather than "Bill".
Sure, you're going to jump in and say that it could easily go the other way. "Sue" might end up being a xanax abusing college co-ed who stars in numerous Girls Gone Wild videos before marrying a frat boy. "Bill" might go to Harvard medical school and become a world reknowned pathologist. But the ODDS are that it doesn't work that way, and study after study confirms this. The income, social status, and IQ of the parents has a gigantic impact on how the kid usually turns out.