As the United States explores ways to deal with shootings at schools, some Americans argue more people should carry guns. “The only way to stop a bad guy with a gun is a good guy with a gun,” President Donald Trump told the National Rifle Association in April. More states are giving teachers permission to carry guns, he said, and “who better to protect our children than our teachers, who love them.” But, a look at unintentional shootings by law enforcement officers, including some at schools, raises questions about whether more guns would help keep students safe.