This isn't really a surprise, there were complaints a few years back about what soldiers were sending back and nothing had to do with bandwidth, "terrorist" hackers and so on. I'd say that this is much like the "needles under the fingers" remark by Rumsfeld on national television about a year and a half before the Abu Gharaib "scandal". I'd say this ban has a lot more to do with the fear of the government over the fact that U.S. soldiers were sending back true life accounts of what is really going on in Iraq instead of the sanitized version the government wants the American public to see and (hopefully on their part) you subsequently feel.
I realize that any warmaker has to be a good propagandist, and that goes for all sides and countries, how else can you get the peasant to pick up their pitchforks and hoes and rush to the front lines ready to kill the enemy and throw their children into the grind as well unless one is seen as virtuous, noble, patriotic, and the enemy slovenly, immoral, and "evil", a threat to you and the lifestyle one has been accustomed to.
It doesn't really matter, the same tactics have been used over and over for years and they still work because of peoples seeming actual need to be "right" or "good", but are they? they only believe they are "good" because they are told this by the very same people that would throw them into the fire for their own gain and those that buy into it will willingly walk into them for them without coercion because they have been taught since birth to accept it.
I would say the main reason that I oppose restriction on the free flow of information is because some cite "This is wartime, and we need to restrict it" where did you get an idea like that and how do you justify accepting it? because "those who know better" told you so. Several years ago it was stated that this is a war that has no end, so since it is "wartime" your flow of information will be censored and you will accept it. To me, it's an open ended book that has purposely been left open ended- decades, maybe more, can one actually believe it will be less restrictive as time goes on?