Two months before alleged killer James Holmes stormed a Colorado movie theater, murdering 12 and injuring dozens more, police and politicians in a different place were trying to squelch the tremors from their own mass killing. It was in Chicago, over Memorial Day weekend, when police responded to more than 40 shooting victims in about 72 hours. Ten of those victims were shot dead, including four teenage children. Alas, despite the fact that more people died that weekend than in both the August 5 Sikh killings and yesterday's College Station shootings combined, there will be no flags at half-staff for those 10 Chicagoans. It's likely you didn't even know those people were dead, just like most of your friends and family. In a summer of now three much-lamented shootings with multiple victims, Chicago's murdered are the forgotten ones.