User blog comment:Crazy sam10/Revolution update (Not DLC) released on Xbox 360/@comment-1263839-20130126113753/@comment-1187559-20130126150044

To be honest that's the balance of the crossbow. It's not a launcher, it's a crossbow. If it had lethal explosive radius it would just be used to spam bolts into choke points, making more effective than the launchers and grenades.