I think it inhibits the growth of a child, frankly. I've known two instances where people home schooled, and it was very much about filtering out the outside world. Children need that exposure, especially now in the digital age. I mean, if you're so poor a parent that you cannot even send your kids to school for fear of. . . something, maybe you shouldn't be a parent!
There are hundreds (if not thousands) of reasons someone may choose to be homeschooled. Thankfully we're free here (at least on this subject) and don't need a "reason" to do it.
That's a terrible argument. A non-argument, actually. "I'm free to discriminate," I guess.