Presumably the family of 4 isn't a family of 4 from the 1950s. Supporting a family of 4 on $50K or less hasn't been a thing for at a decade, so they were clearly in control of the variables at the relevant point in time.

"Should" is fine because I'm disputing the very idea that this is an issue society should be responsible for solving. If I want a 4 bedroom home or lobster for dinner, buy it, then complain that I've financially overextended myself, is that society's fault or did I go beyond my means?

>A few states are working on restricting birth control, no worries.

So there are no roadblocks preventing them from using contraception in the past or currently. Not much point in talking about "working on" if you're discussing families now...