On the morning following the shootings at Virginia Tech last April, several Korean students missed class here at Arizona State University. We were up together until early morning going over statistical regression, so there had to be another reason that they were missing out on finals review. It turned out that they were afraid to come to class fearing retaliation from students stricken with grief and anger. While we assured our friends there was absolutely nothing to worry about, today – with two university shootings and 12 states considering allowing concealed weapons on school campuses, that may no longer be...