My house is situated very close to a police station. It does not deter crime one bit. My neighbor’s vehicle was broken into last month. The number of vehicles that speed by going at least 10 mph over the posted speed limit far outnumber those that obey the speed limit. I could go on and on.
I was thinking more that a swat team or at least armed police could be at the school in 90 seconds after the alarum was sounded. I don’t think you can equate response to petty theft and speeding with response to a gunman next door.