I can see why teachers and children will be happy for the CCTV. It's for the absence of any doubt. Teachers like it because, if they're accused of improper behaviour towards a child then it's a simple case of referring to the CCTV instead of going through a suspension and months of uncertainty. I saw a report which said "mud sticks" when teacher are accused of such things. Even when they're cleared the accusation can end their career. Similarly, teachers can make kids lives hell when something's been "stolen" from their desks. A lack of common sense and people taking responsibilty for their actions has led to this.