alt Hacker NewsCar seats as contraception is just a specific enumeration of the general. "busybodies as contraception" problem wherein the "has so few real problems they stop minding their business and mind other's business" classes try to force priorities on the rest of society that the rest of society can't yet afford to have. And it's not just contraception or kids. Pretty much everything in our economy gets shot in the foot by this to some extent.
Contraception is a bargain deal for any class, assuming you were not intending to have a kid.
I also question the idea that safety regulations (let's call them that) are the result of a class of people who have "so few real problems they stop minding their business and mind other's business." I get the idea, but couldn't the high cost of obstetrics and child car seat requirements be due to the wishes and decisions of people outside of this supposed class?