This undated photo provided by Eric Paddock shows his brother, Las Vegas gunman Stephen Paddock. On Sunday, Oct. 1, 2017, Stephen Paddock opened fire on the Route 91 Harvest Festival killing dozens and wounding hundreds. Paddock spent hours in casinos. and was known for betting big on video poker and staring down fellow gamblers. There is no indication, though, that any particular grievance set him off. But details that have surfaced so far about the one-time IRS agent and son of a notorious bank robber, are clues, at least, to his mindset. (Courtesy of Eric Paddock via AP)
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The Psychology Of Mass Killers: What Causes It? How Can You Prevent It?

There is now an average of one mass shooting each day in the USA. By any measure, this is a national crisis.