I think a lot of people are very naive about how much the internet has increased problems for organisations like schools and local authorities.
Can I set out a possible scenario based on a case I was involved in recently - obviously this chain of events didn't happen, but it is easy to see how it could have done. I was representing the defendant in a domestic violence case where the victim had fled to a refuge in a different part of the country. There were a lot of logistical problems and various courtroom discussions in the absence of the defendant. The victim was giving evidence by video-link from her local court to our London court. Imagine events unfolding like this:
The victim does not want to attend court - there is an application for video-link to her local court which is named in the application - I undertake not to reveal this information to the defendant.
The victim still refuses to attend court on the trial date. There are discussions in the courtroom about what to do - the police liaison officer speaks to the refuge who manage to persuade her to attend and give an eta of 30 minutes.
I go down to the cells and tell the defendant that she was reluctant to attend but will be there in 30 minutes.
The victim attends her local court and the defendant is brought into court - there is a problem with the videolink and the clerk, while trying to re-set the connection absent-mindedly says "Hello? Is that Smalltown Magistrates' Court?"
The defendant now knows which area his wife is in, and that she is about 20 - 30 minutes drive or so from the court.
He is released from custody and gets straight on google. He finds that there are refuges in areas X,Y and Z near Smalltown. He has a faint memory of his wife mentioning a family member in area Z. He finds that there are 3 primary schools serving that area.
He googles every combination of words he can think of and then he hits on "St A's Primary School December 2011". Someone in the school has posted some photos entitled "St A's Primary School Nativity Play - December 2011". They haven't sorted their privacy settings and he can see their photos. There is his eldest son in the back row of the photo.
He goes to Smalltown and stands outside the school gate until his wife turns up.
This is an entirely plausible chain of events. It's not going to happen every day but it is plausible. Surely it is better to assume that schools have a good reason to put stringent measures in place than to assume that they are just being annoying?