Are you sure you are not self-selecting? Are those people represent a random set of homeschooled adults or just the ones who were successful despite it?
Also, who is homeschooling in the set up of two working parents? Or we are going to pretend this work does not exist as we do with other household chores?
I'm sure I'm self-selecting. It's a total anecdote and not worth much other than to point out that home schooling isn't an obvious failure to be written off as the OP seemed to be indicating by his / her tone.
It might not be for everyone-- I'm not homeschooling my kids-- but I've seen it work, and I hope it's an option that remains legal.
Also, who is homeschooling in the set up of two working parents? Or we are going to pretend this work does not exist as we do with other household chores?