That shooters tend to attack targets where they can carry out an attack without any effective interference is a frequently demonstrated fact.
Several armed teachers or other volunteers in every school would eliminate virtually all school shootings - cheap, easy and effective. Rational measured solutions to problems tend to work best.
Sun/shadow angles recorded in pictures taken at the wrong time of the year. The school parking lot marking and painting did not comply with ADA. As I've already mentioned, the demolition company and its employees were made to sign non-disclosure agreements. If you are genuinely curious, consider Sofia Smallstorm. There are others too, including Wolfgang Halbig
I suppose that is a common sense angle, yes. Just as Bonnie & Clyde used to case the place where they planned to rob, I guess school shooters do the same, in the school they attend daily. True, but perhaps meaningless. I once saw a short story on TV about a school in a small town in Texas that has had armed teachers since this whole thing started. Obviously, they have never been chosen as a target, whether by actual students or those wicked creatures that might stage these events.