[Izzy Dunne]

had the homeschool advocacy groups acted quickly to disavow themselves of warts and marginal cases

And how would they do that?
I see no value in some group standing up and saying "Homeschooling doesn't advocate practices such as this".

[Chancellor Palpatine]

Why not? It lets people know that homeschooling is serious, and not just an excuse to sleep in and schlep around all day, which is what at least 90% of the folks at our cottage school did.