I don't think the families matter, quite frankly. They probably have varying opinions on it, in any case.
This is an American monument to American people who did something very important in a time of crisis. The monument is for us to remember them, not for their families or their families' memory of them.
It would be nice to find out the opinion of the widow of Todd Beamer (sp?). Somehow I don't think she would agree with the warm, fuzzy platitudes that were expressed in the article responding to Rep. Tancredo's criticism. Just the other day the History Channel or National Geographic channel had a special about Flight 93. It thought it was strange at the time that there was no interview with Mrs. Beamer, but plenty of time for other family members. Could it have something to do with the fact that Mrs. Beamer is a devout Christian and as such as not likely to be taken in by the the garbage spouted by the "families".
It appears to be a battle victory monument more appropriately located somewhere outside of Damascus.
"This is the site where the Sons of Islam sacrificed all to slay the indolent infidels on their plane. They were not successful in achieving their primary objective of killing the American President, but their deaths were not in vane."