I disagree. Human beings are born with the ability to be parents, and for nearly all of human history, that meant teaching their children (often in cooperation with other parents and families), not sending them off to strangers to be taught.
Especially in the earlier grades, the vast majority of parents who bother to marry before having babies, and who bother to stay married, are quite capable of teaching or supervising the education of their children.
I've frequently seen homeschooling parents help their children learn academic subjects that were beyond the initial knowledge of the parent herself, either through the “one step ahead” method (just make sure you learn the material one step ahead of your kid), or through obtaining third-party materials and supervising their use, or through homeschooling co-ops or tutoring.
As for the relative difference between what parents can do versus what public schools can do, the dirty little secret is that the public schools generally available to the kids whose parents would most be in over their heads homeschooling generally are the public schools that suck, that don't prepare anyone for anything, that teach little and mostly warehouse their wards. The children who get to go to "good" public schools are generally the children of the folks best able to homeschool their children.
Good homeschooling beats even good public schools hands-down nearly every time. And even mediocre or poor homeschooling beats a bad public school every time.
It was that way a hundred years ago; it's that way still today.
sitetest
So you think all those children with one parent who is functionally illiterate could learn better from that parent than at a competent school? The fact is the numbers of home-schooled children is only at about 5% or less of the total numbers of school age children. And those parents are highly motivated. Good for them. As I keep repeating, I’m not against home schooling. I’m just saying you’re never going to get a sizable percentage of parents who will be able to home school their children.