One reason may be that Hijab and Niqab are politicized. Culture wars are happening on the expense of these women who just want a normal life and basic human rights.

Edit: I also just read the news article on Aljazera Arabic and one thing I did like is that they emphasized that all female students are free to wear Hijab as long as it’s their choice and they are not being forced by parents, but there is a full ban on face covers for school-aged girls. This changes my view on a bit, I think up to a certain age it should not be okay to come to school with a totally covered face (unless it’s for some reason necessary). However, once you get to high school level or bans in the workplace, it gets problematic.

I would still have much rather seen schools take a bigger active role in the lives of students who wear the Niqab and discuss the issues with the parents.