I have some personal experience with this as i was home schooled for most of my life. There seemed to be two viewpoints that most JWs had about public education. One was that public education was just too dangerous and would teach kids the wrong ideas and involve them with bad influences. When I was growing up my parents also believed that the schools were failing to teach kids how to read and write properly. For those reasons I was enrolled in an alternative school. The curriculum was chosen by a teacher but the work was still done at home. Every few weeks we would go and turn in samples of what we had done and talk to the teacher about our progress, goals etc.
Some people though viewed this as a way of sheltering kids from the real world and believed that kids should go to public school as a way to prepare them for real life. By going the home school route you avoid many of the things that can test a young persons faith. Things like birthdays, holidays, flag salute can all be avoided with home schooling. So I guess some felt it was better to test the young people by making them stand up to these things at early age. I know for me personally since I was never around worldly kids I didn't see what the big deal was about holidays and never really felt different from others because I had a core group of JW friends. I loved not going to school because I had so much free time that other kids didn't get to enjoy. Now though I can see that I was stuck in a JW bubble even at that age. I never was exposed to anyone who didn't believe exactly as I did. I never really learned to make friends, the friends I had were more by default than anything else.