so a group of FBI agents was going to arrest this guy and prepped for it in advance, but as they were doing it they just had to shoot him dead?
This sounds too convenient, may be there was no case (as usually the case) and they wanted their medals now instead of years of litigation and PR nightmare exposing how they bated mentally retarded men into making a fake bomb. May be their plan just downright sucked ass. From Shitcago statistics, vast majority of arrests going wrong and involving a shootout, the perp ends up living, not DOA. Either way this stinks.