Well, the historical process, by nature, is always under constant revision; that is to say, the interpretation and understanding of prior events and their impact on past societies, as well as the present-day, has always been, is (and I believe), will continue to be, the subject of revision.
The problem with so-called, "Revisionist History", has been and is still largely associated with the historiography and historical pedagogy of the past 25 plus years-(primarily at the college and graduate levels). It has been the rise and onslaught of Political Correctness that has debased and trivialized the practice of historical research and education-(and, rather cynically, hides underneath the veneer of Multiculturalism).
There has been, since the early 1990's, a deep politicization, indeed, a radicalization of how history is written, but also, how it is expressed and taught in colleges and universities. The Politically Correct history that has plagued contemporary American historical education and publishing is essentially rooted in the wild social philosophy of Post-Modernism and its Dogmatic relativism which began in the 1960's with its Pioneer, Michele Foucault. In other words, "the rules have changed" whereby so-called traditional historical education would focus on U.S. History, Western Civilization and the secondary or parenthetical study of non-Western civilizations and cultures. However, since the early 1990's-(or perhaps earlier, i.e., "The Closing of the American Mind"), it has become the reverse or the same model still exists, though is now the subject of rabid hysterical critiquing and near vilification. In the Politically Correct age, Western civilization, in particular, has, in a way, become a type of pinata whereby its most vocal of vocal critics symbolically "smash it to pieces" as a way of catalyzing a new historical narrative..........(meet the new Iconoclasts).
This iconoclastic approach towards historical understanding and teaching is less concerned with historical veracity and more preoccupied with the promotion of a radically activist agenda. The politics of revisionism is the weapon of choice for the Politically Correct Activists and the sad truth is that they have been winning since the early 1990's and even into the present-day.
Revisiting and revising history is nothing new, nor should history ever remain exempt from re-visitation and revisionism. With the fantastic advancements in technology, fields, such as Archaeology, Genetic Anthropology and History itself, can examine the past with greater accuracy and refinement that is truly unprecedented. The aid and assistance of technology-(though far from perfect) has provided and equipped our age with a more objective interpretation of the past. However, the pioneering and fantastic success of technology cannot necessarily prevent the determination and perseverance of agenda seeking activists who have and will continue to undermine the historical process through their own process of radical revisionism and activist historical education.
Politically Correct revisionists are a major presence and they will continue to present a serious challenge to historical education and discoursing.