To me this argument is just pathetic. Sure, we don't see flagged draped coffins at Dover, but there are a half a million "tribute" websites that don't stop at flag draped coffins, but give names (and often photos) of each and every Service Member killed in Iraq and Afghanistan theaters of operations.
The argument seems to assume that if we actually seeing the flag draped coffins would somehow more "personalize" the deaths of the 1000+ Americans who have been killed. Well, how is a flag draped coffin any more personal than the service member's name, age, hometown, photo, and often, how the person was killed?
The government has not only done nothing to keep the public from viewing these sites, in many cases the site itself is run by the government.
If the goal of those who want flag draped coffins is to personalize the deaths of these people, the government is failing miserably. I think the arguments have much more to do with a press that resents being denied an opportunity to propagandize the coffins than anything else.