Most or all of those kids went to public school. People who care for their children as other than fashion accessories will keep them out of public school. There are no exceptions to that, not any more.
Ignorance comes from government education.
I have 8 grandchildren and they are all homeschooled.
They know history, music, mathematics, science, geography, languages and good manners.
Parents who send their children to government schools are diminishing their knowledge of the world and their ability to cope in it.
Sending your kids to public school is akin to child abuse!
But our school system is different. That's what the Superintendent tells us. And the teachers are really nice...
Yeah, we homeschooled ours. The best decision we have made for our children. No regrets. The fact that people who went through government schools can't imagine anything different, tells you that government schools do what they were designed to do.