Worst of all, the witlesses lie, cheat, and steal to wrangle children out of school (along with other custody issues). The goal is that the children can count toward the witlesses' 7+ million (inflating the total even more), while making sure they cannot function outside the cancer once they grow up. The reasons for home schooling in these cases usually involve schooling around field circus, being able to use the Washtowel and Asleep! rags in lieu of real text books, and so they will not have class trips and extracurricular activity that interferes with boasting sessions or field circus.
While there are advantages of home schooling if the parents are committed and capable, I don't think this is one of them. Home schooling requires a parent that has plenty of time, is fully integrated in thinking and able to pass it to children, and lots of money for equipment that schools share. To properly home school a child, you have to spend all that money to have access to labs, proper field trips, and all the equipment that schools might have (movie projectors are a prime example). They need all the proper videos--which can cost plenty of money. They need to know what is expected in all subjects at all grade levels, and be able to teach it. And, I am afraid that this is rare even among worldly people.
And you need a proper motive. Just to protect children from the world is not enough. They cannot be taught with the Asleep! rags, or taught the lies that the Washtowel teaches them. They cannot be limited to other witlesses in social contact, or they will never be able to function outside the cancer. If parents are doing this to prevent them from being able to function outside the cancer, they should not be permitted to do that. And, with most Jehovah's Witlesses trying to home school children, this is the motive.