Well, it does seem to be giving short shrift to the "BODY" of Christ concept, as if leaving the world's side means going off into a vacuum. The church isn't supposed to be a herd of cats.
I don't agree with isolationism either. I get that impression from reading some folks' materials, and I do have a bit of that attitude myself. It's unfortunate, but I do think most parents get into homeschooling out of genuine concern for their children.