I think Pastor Elrod here summed pretty well how we should feel in regards to al Qaeda's new tactic of using the mentally handicapped to carry their bombs.
The Cowards Called al Quaeda
Of course, consider how the "conversation" goes, I'm not going to hold my breath waiting for someone to posit that it's really our fault that they are doing this. Remember, some people actually blame churches who have security guards when someone shooting people in their churches actually get shot themselves. Point being that the gymnastics of blame can get quite loony.