Connor Betts, the Dayton, Ohio mass shooter, was a self-described “leftist,” who wrote that he would happily vote for Democrat Elizabeth Warren, praised Satan, was upset about the 2016 presidential election results, and added, “I want socialism, and i’ll not wait for the idiots to finally come round to understanding.” Betts’ Twitter profile read, “he/him / anime fan / metalhead / leftist / i’m going to hell and i’m not coming back.” One tweet on his page read, “Off to Midnight Mass. At least the songs are good. #athiestsonchristmas.” The page handle? I am the spookster. On one selfie, he...