It's funny how the one thing that was never mentioned in the whole article is how well the staff at the school knew the parents of the kid. I say this as it was a support staff member of my high-school that outed me to my parents under such circumstances. In my case however, they only did so because I trusted and confided in this particular staff member and they got to know my parents well enough to know that it wouldn't cause any harm at all to do so, and would actually make explaining certain things easier.
It all boils down to circumstance in the end, and how well the parents were known, etc. The argument that it could have made a bad situation worse is true, but misleading since there is a great chance that the staff knew the parents and knew the situation. I'm not sure I could formulate an opinion on either side on this one.