I'm suspicious of the binary nature of this debate which I think is quite dangerous.
Very clearly there are children who don't do well in a school environment and HE has saved the lives of some, probably. There absolutely is a place for it, particularly with ND children.
But the blanket idea that school is bad and parents who keep their children in school are abusing them is profoundly wrong in my view. There are nuances which are being missed in this discussion. To name some that spring to my mind:
Firstly, it's not automatically true that allowing people to avoid something which causes them anxiety is a good thing. Sometimes it is essential. But sometimes learning to face and conquer the anxiety is ultimately a strengthening thing. I've gone through periods of really hating school, as has my DD. Ultimately, I've emerged stronger from having to push through them.
I am thankful never to have dealt with school refusal (yet). I don't want to minimise how tough this is and I know it's incredibly painful and difficult. But I do think that it's one of those things, like suicide, which can be catching. The more children become aware that other children are allowed to dodge school, the more they are allowed to feel that it is normal. While I think children who can't face school need to be treated with kindness and dignity, there has to be a red line and an understanding that it can't become a new normal.
For better or worse, school prepares you for adulthood in some way. Very few children are going to be able to avoid some sort of pressures, deadlines, friction in the workplace. For children for whom this is completely insurmountable, such as those who are ND or those who have been badly bullied it is cruel to force them into an environment where they are going to be bullied and judged. But I'm not sure it sends a great message to children that they can avoid things in life because they cause them anxiety and difficulty. At some point that protection is going to come to an end and having to face the cold reality of the world in your mid to late 20s after having been shielded from competition and friction is not great in my view.
For most children in most circumstances I believe school is a net positive. I totally understand why parents of children who have really struggled would feel quite dogmatic about the benefits of HE. But I think we ought to be careful of poisoning the well of perception for the broad mass of people.