Schooling in isolation could threaten civic cohesion and diversity of thought, says Stanford University education professor Rob Reich. Reich favors stricter homeschooling regulations to supplant the current patchwork of state laws so that children can be assured of exposure to more than just what their parents sanction.
Apparently he believes that parents don't have the final say in the upbringing of children, but that the state should play a role.
And while it's possible that civic cohesion could suffer if everyone were homeschooled...not proven, mind you, but worthy of investigation...it's not "diversity of thought" that stands to suffer at the hands of homeschooling parents; rather, it's conformity of thought that would face decline.
And that's what Robby really fears; that the American state will lose the capacity to forge a homogeneous worldview among the electorate.