I don't want anyone shot or killed, but better one shooter than multiple victims. Gun free zones assure the shooter that he is unlikely to be shot. Even crazy people are influenced by circumstances. Obviously these presumed psychotic men are able to plan. Crazy, but not stupid?
During my residency I rotated through psychiatry and worked on a psychiatric floor at Ford Hospital.
When a psychotic (it was always a man) became threatening, the plan was to call as many large men-residents, staff men, orderlies-to the scheme. Never did any violence occur.
Donald W. Bales. M.D. retired