> That makes about as much sense as banning marriage.

Banning marriage actually makes a lot of sense, according to some. Why is the state even involved in such private matters in the first place anyhow?

Same reasons it's involved in medicine, housing, education, etc etc.

Medicine kills people. I never saw someone die from marriage

"Marital discord was significantly and positively associated with suicidal ideation and suicide attempt, and these associations remained significant when controlling for demographics and 12-month prevalence of mood, anxiety, and substance use disorders" [0].

[0] https://onlinelibrary.wiley.com/doi/abs/10.1111/sltb.12157

I'm sure lots of people have committed suicide because they were stuck in bad marriages (esp. before divorce was legalized).

Lots of women get murdered by their husbands (and sometimes the reverse).

M&S is not fundamental, I didn't ecen exist as a concept untill fairly recently in the history of Capitalism.