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Not doing due diligence is a legacy of Columbine, where waiting cost lives. https://en.wikipedia.org/wiki/Columbine_High_School_massacre#Police_tactics https:/

• deleted 5y ago
  [deleted]
• watwut 5y ago
  They waited for very long time after many reports of shooting. The ongoing shooting was heard outside. You talk about the change of tactic in case of multiple times reported mass shooting in public building. It is not nearly the same situation.