No. If we let them live, as long as these two dirtbags were alive, the media would be harping on how the Iraqis are rallying around them as they sit in a prison cell, unjustly jailed by the imperialistic fascist selected President of the US. The left would demand thatnthey be given a "fair trial by the Iraqi citizens" (translation - they would have to be brought in front of some sham "tribual" where acquittal would be guaranteed and they were allowed to escape to a life of exiled luxury in Saudi Arabia).
Far, far better that these animals are dead - the best thing that could happen (assuming that they're in large enough pieces) would be to hoist their corpses from a streetlamp and let the buzzards work them over.
Stay safe !