Yes but then that would deprive people of the potential joy that is motherhood/parenthood
You got lucky that's all. You got pregnant and realised you enjoyed parenthood. I'm genuinely happy for you.
However....
There are women (and men) who really, really want children, believe all the crap about technicolour moments (were you that mad poster too?) and find that they don't like it.
There are women who get pregnant accidentally and think what the hell, everyone says I'll enjoy it and unconditional love, snuggles and all that jazz. And find they hate it.
Now where does that leave those parents and, more importantly, the child?
I'll tell you....children know when they are not wanted. It affects every aspect of their life forever. There is no feeling quite as bad as the knowledge that your mother (as it was in my case) didn't really want you and only had you because it was the done thing and she was lead to believe it was different with your own, you'll feel unconditional love blah blah blah.
Frankly she shouldn't have bothered.
If more people put as much thought into having children as childfree people have put into not having them, then there would be fewer crap,parents in the world.
Oh and being the parent of an only child is still being a parent.