Can Maine shooting and public support for red flag laws finally spur action?

Last week’s horrific shooting in Maine that left 18 dead and 13 others wounded has already raised the questions that have become familiar after mass casualty events. What motivated the suspect, 40-year-old Robert Card, to go on his rampage in a Lewiston bowling alley and bar? Why was the U.S. Army reservist, who had been hospitalized for a serious mental illness as recently as this past summer (an episode that reportedly included hearing voices in his head), not under closer supervision? And how is it that he had unfettered access...