Earlier quoted context omitted.
did they know rent would be 70% of their income when they decided to have their first child? their third?
This is pretending a world is perfect. If pregnancy were easy to prevent, folks would have done it well before modern times. But that simply isn't the case. It doesn't matter if they knew the rent was that high, and it isn't like folks can avoid this in all areas. Expecting a couple to never have sex is unreasonable and pregnancy cannot always be prevented. In some areas, access to abortion is abysmal, though in some…
you have to improperly use (or eschew entirely) the several forms of birth control available. you don't need insurance to buy condoms, and they are not particularly expensive. even if you can't afford to buy hormonal birth control, an IUD, or condoms outright, you can often get them for free or very cheap through planned parenthood. if you are even using one of these correctly, your risk of pregnancy in a given year is if everything I mentioned above has gone wrong and you actually bring a child into the world that you did not plan for, you can still put the child up for adoption. the demand for newborns is quite a bit higher than the number that are actually available for adoption.
I can easily believe there are a lot of parents out there who had good plans for raising their children that went sideways due to truly unforeseeable circumstances. I think there are also a lot of parents who chose to have children without having any idea how they would support them. what I don't believe is that there is a meaningful number of parents in wealthy countries who are stuck supporting children they had no intention of raising.