If they're so eager to die a martyr's death, why do they object when someone kills them?
One offer I might make to the Iraqi's is to strap bomb belts on these perps, send them wherever large caches of munitions are found and use them as a less expensive way to rid the area of those harmful munitions and help them arrive at their quest for getting their 72 virgins at the same time. Another suggestion - with the same bomb vests firmly attached, use the guilty to check for those pesky mines that are left over on the Iran/Iraq border.
Besides that, can you just imagine the price hemp rope is going to be at the rate that the Iraqi judicial system seems headed?