In a way installing surveillance cameras are just a confession: Dear public, we always used to keep an eye on you and in the old days we would let teachers roam the school grounds to keep an eye out, but you know just as well as we that we can be arsed anymore. We rather sit somewere and hope that the day will pass soon enough so we can leave this stinking place.
But we don't want to let you assume that we don't care about you anymore. We installed cameras so we (well, actually some guy behind a wall of monitors) can examine closely your hideous acts, or spend most of his time sleeping if he isnt under surveillance himself. We didn't tell him of course. We just hinted he might be under surveillance. Keeps him on his toes and his hands out of his pants.
So don't eat your snot in public. We might be watching you.
But we don't want to let you assume that we don't care about you anymore. We installed cameras so we (well, actually some guy behind a wall of monitors) can examine closely your hideous acts, or spend most of his time sleeping if he isnt under surveillance himself. We didn't tell him of course. We just hinted he might be under surveillance. Keeps him on his toes and his hands out of his pants.
So don't eat your snot in public. We might be watching you.