Well, bear in mind that at least some of these kids must have special needs, which is probably why they have to employ a behaviorist.
My comment was not directed at this school and certainly not any of its children in particular, just on the benefits of School Video Surveillence. Moreover the focus of the article, IMHO, was on neurotypical students in an atypical setting, i.e. Montessori self-directed learning.
Parents with children having special needs are rightfully more vigilant and concerned about their child's progress and status. The classification of Helicopter parent does not apply here, as there is a justification for it.
Having said that, I have a child in a Montessori school currently. Last year I suggested a PTZ be placed in a large common area. This school has a large pre-k population and parents sometimes have to drop their children while the child is crying or upset. Because the parents imagine that the child will be crying for hours if they leave, they often linger to observe. This usually just extends the crying until the parent leaves.
The idea was to give parents a way to see that the child was ok after they left. In this case a touch screen pvm would be in the outer area.
They said they like the idea and are getting a quote from their 'guy'. Unfortunately, its the same guy who provided this Access Control masterpiece.