It goes back to what I've said before, there is a difference between truancy and homeschooling. The two should not be lumped together. One is wrong, the other is right and reasonable people can tell which one is which at a glance.
Oh, I agree, I agree... I just wonder, from a conservative point of view, why are there truancy laws anyway? Why do we set certain areas the government can intrude on parents and tell them what to do, and other areas we tell it to stay out of? Almost everyone is against the government telling you what religious beliefs you can pass along. But nobody has a problem with the government telling parents that their kids have to learn math.
Don't get me wrong, it's just a thought exercise - why and how have we justified what we have, as far as laws go?