Writing in City Journal, retired FBI agent James A. Gagliano analyzes the strategies and makes some proposals. An excerpt:Why the delayed response? Citing the benefit of hindsight, Colonel McCraw described the decision to wait as “the wrong decision, period.” Cops are fallible human beings. Yes, they make mistakes. The stakes are considerably higher, however, when lives hang in the balance of decision-making that often occurs within an information vacuum. Yet for two decades, law enforcement professionals have talked about the modifications that the profession made to tactical-response protocols following the April 20, 1999, Columbine mass shooting, where an after-action review indicated an interminably long 47 minutes had transpired between the first shots from Eric Harris and Dylan Klebold and law enforcement officers’ entry into Columbine High School. It has been more than 23 years since those painful lessons were learned. Yet it appears we must relearn them.