I think this is done by many in the historical fraternity to keep their standing good so they will have career. Just for most of the Viet Nam the only books published were critical or worse derogatory and slanderous. Now that the 25 year rule has been passed a great volume of hitherto classified documentation has been made available but the history fraternity won't touch it. These documents include following day by day how in June 1965, LBJ felt there was no choice but for large scale conventional intervention as the general VC-NV operational plan had been picked on wireless and easily decrypted. It called for a progressively larger NVA conventional attack, at first out of the LAO Panhandle and then once the ARVN units were cleared out directly across the DMZ. The goal was to isolate destroy the five ARVN division and the SV Marines that the the NV considered capable of protracted resistance. Now outside of one book I have yet to see any of this documentation used. The original US commitment may have been unwise but the attempts to defeat the NVA/VC forces was not an exercise in great power chauvinism and racism.
Re Vietnam (where I was a journalist and then historian specialist on Communist terrorism/genocide for Congress and now Vietnam Veterans for Factual History.org), there are new books on VN using newly found documents.
Some of these have appeared in the approximately 8 volume “Yellow books”, year by year, written by members of the pro-American, proud to have served veterans of that war in VVFH. (See: www.VVFH.org for information on the Yearbooks and the websites which contain some information you will not find elsewhere, esp. in popular “VN” books from the Left and the ignorant).