part of the reason people feel this way is because it gives people an excuse to stop working on themselves
"oh cant do this or that, got kids you know........."
not gonna type out the whole theory but it's pretty straight forward and true, especially for poor people who never achieve shit
When you hate yourself and can't justify your own existence, going to the same degrading job day after day just to perpetuate your misery, you might choose to save yourself by having a kid.
Now you have 'purpose': if you don't continue to grind yourself to dust, your family will pay the price. And you can take some measure of satisfaction for your child's achievements. As long as you have some faith in your child's worth, you can keep going on.
But then, one day, your child doesn't need you anymore. He can support himself, and it's up to him whether he wants to remain associated with his now decrepit parents. And will be want to? Who would want to associate with people who predicate their entire existence on the value of their child, having no worth of their own.
Maybe the child, now an adult, will realize his parents for what they are: people who never found their place in the world and used their children to mask this horror, to overcome self-loathing and suicide or insanity.
Probably, at this point, the parents, being wretched as they are, will try to guilt their child into 'filial duty' or hold them hostage with inheritance... Now will the child be strong enough to cut the parasites off? Being their own spawn, I doubt it. More likely, he'll perpetuate the process, sing the praises of parenthood himself, and suffer quietly.
And so the world becomes a sickhouse...