Dennis Miller calls him one too. I don't know why so many are afraid to challenge that status. I think it has something to do with respect for other veterans, decorated and undecorated. They simply don't want to start undermining them and their credibility, or so the feeling seems to be amongst some of these pundits.
You're probably correct. Look at Miller's and Scarborough's ages and Nam is relatively close to them. Perhaps they mistakenly believe they are respecting those veterans by not contributing to the brouhaha. Personally, I think they're wrong. Veterans of Nam went through Hell on their return home (and prior to it, of course) and the only way to change that perspective is to tell the truth.
I appreciate the Swiftees trying to set the record straight and change the perception so many have of the Viet Nam warrior.