Most shoppers crouched behind checkout counters or bolted toward the back exit. But as a gunman fired inside a Wal-Mart store in a Denver suburb, some patrons took a more defensive approach: They grabbed their own guns. They were the proverbial "good guys with guns" that gun rights advocates say have the power to stop mass shootings. But police in Thornton, Colo., said that in this case the well-intentioned gun carriers set the stage for chaos, stalling efforts to capture the suspect in the Wednesday night...

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