Is that the reason why FuckFrance bravely censors mockery related to the US army and 9-11?
Oh look, our resident gerbil tester is back. Manure ol bean how the HELL are you?
To answer your question: The mocking of deaths and the 9-111 incident always shows that the poster is a troll and not desirous of real debate. That's why it is generally squashed (along with the poster)when it occurs. It isn't far from an absolute that when the topic is as emotional as those two are, that no discussion can remain nuetral and cool.
Mocking the deaths of American servicemen and women is therefore not advised and mocking the 9-11 event is forbidden, this helps to keep people discussing the topic and not turn it into a flame war.
This doesn't prevent the discussion of perceived deficiencies in the US armed forces, that's still fair game, just expect to get your head handed to you.