I will let the first paragraph of Richard Collins essay, Sham homeschools are fostering a radical right wing fifth column, speak for itself.
Until the 1980s homeschooling was a benign activity that effected very few children. After homeschooling became dominated by right wing Christian theocrats, millions of vulnerable children (estimates are suspect because of poor reporting requirements) became virtual prisoners in their own homes, pawns in a scheme to overthrow the United States Government and replace it with a theocracy. The theocrats scheme includes lobbying state legislatures, pressing free exercise of religion cases in the courts and collusion with extreme right wing Republican officials. The result is an almost total lack of oversight by government officials. It will require dedication for the new administration to undo the Bush administration handiwork.
Wow. By the way, he is serious. Really.