Quite what the emotions of these people were after the engagement is immaterial the moment some numbskull decided to take a picture. The behavior might well have been heat of the moment, but capturing it on film is not. It is desecration of the dead, plain and simple. You don't have to be Christian, Muslim or non-affiliated looney to understand the repercussions this type of photograph brings.
If you don't understand that common decency is not only what separates us from the barbarism of those we fight, but defines who we are, there's probably a lot more about a civilized society that will be lost on you. As you suspect Melmoth, this thread is like pig-wrestling, the pig loves it and you get covered in ****e.
As for the armchair warrior pitch, if you have to tell people you're in charge, you're not in charge.