I suspect evolution dealt with 'bad parents' long ago.

My parents certainly weren't bad. Not that they ever did much beyond enrolling and sending me off to public school, but still. If public school wasn't there, I'm sure they wouldn't have left me completely illiterate. In fact I'm sure, and my parents now agree, I would likely have been 'better' schooled if it wasn't for public schools' near complete monopoly on funding and mindshare when and where I grew up.

None of the parents of people I know were 'bad' either, including those of many who insist on using mythical 'bad parents' as excuses for public education. Furthermore, amongst those I have asked, none of them seem to have acquaintances with bad parents, and I have asked enough people, from enough different backgrounds, to be convinced this 'bad parents test' could be applied recursively through all six degrees of separation without turning up more than, at most, some exceedingly rare corner cases. Rare as in at least an order of magnitude below likely available private charity to deal with them.

This doesn't mean I think everyone's parents are equally ambitious on their children's behalf, or equally concerned with educating their child; just that in absence of public schools, almost no parent would completely neglect facilitating any kind of education for their children, whatsoever.

Your views are shaded by your socioeconomic class. The "bad parents" I refer to are the urban poor that depend on the government to survive and have more children than they can afford. The government is preventing natural selection here, but the alternative is to let our class of urban poor die off. Maybe it would work, but it's politically impossible.

> I suspect evolution dealt with 'bad parents' long ago.

The whole thing about evolution is that it never stops. However, evolution's definition of bad parents is brutally simple: those who have few descendants.