For 45 senators, the carnage at Sandy Hook Elementary School is a forgotten tragedy. The toll of 270 Americans who are shot every dayis not a problem requiring action. The easy access to guns on the Internet, and the inevitability of the next massacre, is not worth preventing. Those senators, 41 Republicans and four Democrats, killed a bill on Wednesday to expand background checks for gun buyers. It was the last, best hope for meaningful legislation to reduce gun violence after a deranged man used semiautomatic weapons to kill 20 children and six adults at the school in Newtown, Conn., 18 weeks ago. A ban on assault weapons was voted down by 60 senators; 54 voted against a limit on bullet magazines.Patricia Maisch, who survived a mass shooting in Tucson in 2011, spoke for many in the country when she shouted from the Senate gallery: “Shame on you.” Newtown, in the end, changed nothing; the overwhelming national consensus to tighten a ridiculously lax set of gun laws was stopped cold. That’s because the only thing that mattered to these lawmakers was a blind and unthinking fealty to the whims of the gun lobby.