You have to admit though that is such a weak argument in favor of abortion.
No, I don't have to admit that. It is not weak at all for the women who had no other choice and were permanently sterilized due to infections from a botched procedure. It is not weak at all for the parents whose daughters chose back-alley abortions and died as a result.
You want to know how to slow down the abortion rate? Make the fathers liable and hold their feet to the fire. Put deadbeats in jail, or put them into a debt that cannot be erased by bankruptcy. Hold it over their heads that THEY are equally responsible. As long as men have apparent impunity, the problem will not go away. And we can't forget that it takes two to tango. You want to slow it even more? Assure that there is at least SOME meaningful level sex education so that kids learn what actions lead to those consequences.
But the fact that it's still done doesn't mean it ought to be allowed.
This is actually a mirror microcosm of gun control and several other movements in the USA and around the world. There are forces trying to control and limit other people's lives because they believe that if they succeed, the world will be a better place. Whether we are talking abortion, gun control, the war on drugs, or abolition. Pick your other favorite vices while you are at it.
What gives anyone the right to say that something should not be allowed? Obviously, we want to stop murder, robbery/theft/burglary, assault/abuse/ra**, riots/arson/property damage, ... lots of things that are clearly anti-social and highly disruptive to society. Nobody wants total chaos. However, when we talk about enforcement on these issues, we are blind to a word that is sitting right out there for all to see... FORCE. The center of enforcement is to FORCE people to "properly" behave themselves. The problem is that no two people are alike. (Even identical twins diverge in some ways.) What IS proper behavior?
"Proper behavior" is not uniform within our country. With legal immigration, we let in people who come from cultures which accept honor killings, females as chattel, live animal sacrifice, use of psycho-active substances as part of a religious ritual. The list goes on, and we have that pesky little amendment that forbids discrimination based on national origin among other causes. So how do we justify that they can't do here what they used to do - with honor - in their former culture?
Unfortunately, we have too many people with a social agenda who try to take away from others that to which they object. We tried to stop people from imbibing alcohol, the "Prohibition" amendment. Took us only 3 years to decide that was officially a big mistake and repeal that foolish idea. Can't stop smokers either. We try, we do our best to educate, but doesn't stop everyone. The war on drugs is failing miserably. Gun control won't work for people who don't give a hoot about gun laws anyway. Human trafficking (slavery and/or prostitution) is another practice that is older than dirt. Make abortions a criminal act? Won't stop something that has been around for over 2000 years. Actually, based on some older writings from Egypt, older than that by 1500 more years... so at least 3500 years of abortions. And we don't know if they are even older, but the writings farther back than that have decayed by now.
Moan and groan all you want, these problems will not go away. This is all about the question, "Am I my brother's keeper?" And in the USA, the answer should be a resounding "NO." We cannot control people. We cannot put a leash on them and make them prance around like pampered pets. Doesn't work that way at all.
You want to stop all of those terrible things? Don't drop your tax dollars down a bottomless "enforcement" pit. Spend money on better education for young kids so that they will KNOW the perils of these temptations. Reduce the acceptability of home schooling so that kids get a better view of reality than a "mommy and daddy ideal world." Maybe that won't completely stop things either, but if it reduces the frequency of occurrence of these undesirable things, maybe we can get it down to a level where the law of diminishing returns will reach an equilibrium point.
Human nature is one that seeks freedom. ("We hold these truths to be self-evident, that all Men are endowed ... life, liberty, and the pursuit of happiness." Remember that one?) Forcing people to fit in someone else's mold is doomed to failure before you start. So instead of making something illegal, how about addressing the problem in a different way that would help reduce its frequency down to the "whoops" level, where the "fringe cases" are few enough to be recognized as simple "whoops" exceptions?
Here is a mental image for you that comes from a commercial from a few years ago. Getting people to go in a specific direction is a really hard process - like herding cats. Good luck with that.