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What would they have waited for before re-opening? For the perpetrator to be caught? And if he wasn't caught immediately (he could easily have hidden his two handguns), how long would the campus have stayed closed? A day? A week? Until the gunman's capture? Foreseeability is not as easy as hindsight, but in any situation, you have to proceed on the information you know. The headlines say it all: the single deadliest gun massacre on American soil ever. How are the police supposed to predict that?