Second: we already have that. It’s called the pill.

On the contrary, it seems the breakdown of the strong family unit is causing most of the problems of society.

My case would support your supposition because I was distressingly incompetent in my early 20s. I wasn't a prize at 28 (my first born) either but at least I was at a point where I could form better expectations for myself.

Past that, I find most young people today to be measurably more balanced & competent human beings than my generation was. I have strong confidence in their abilities to guide little people.

To be clear tho, even in my generation I was a terrible outlier.

Sterilized people are much less likely to propagate their habits to the following generations.

So sterilization habit is unlikely to stick.