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.
I assumed the retort would be about response time. If we were serious about that, there would be metal detectors at each and every entrance to schools as well as armed guards at each and every entrance. That might actually provide a deterrent effect.
My point was proximity to a police station does not equate to response time or a deterrent effect largely because most police stations are staging areas for police persons to punch a clock and pick up their patrol vehicle. A dispatcher sits inside, but next to no police do.
Response time to assault, breaking and entering and petty theft or response to / patrolling for even more “innocuous” things like speeding and other traffic violations is also nearly non-existent in close proximity to a police station.