It's a shame the pilot was so far away from the aircraft when the warhead was released.
Had this happened in 1945 and involved people on board a B-29, I don't think anyone would be very concerned, though some of the more sensitive might have muttered, "war is hell."
Had it been fired by an F-16 or A-10 in 1995, there would be more concern but I really don't think anyone would feel "shit happens" fails to adequately address the issue. Because shit does happen, after all.
But it's 2015 and, to our horror, we learn that the pilot wasn't on board the aircraft. It was a "drone." So this is very, very serious indeed.