Some of that is an academic factor in ways that you otherwise will simply not be noticed.
To use a more... popular example. Most "academic" Holocaust denial is historically of the technical type. David Irving's entire case ultimately rests on the technically true fact that there is nowhere a surviving record where Hitler specifically wrote out an order for anything that led to an actual event. To Irving this means Hitler wanted to stop it and everyone was keeping him in the dark. To everyone else it means Hitler didn't have to specifically write down what he wanted because it was pretty fucking obvious and he expressed his opinions on everything else going on in the universe to anyone who would stand being with him for long periods.
The other large part of Irving's cohort is saying, "well, sure, the Holocaust, but what about the allied bombings?" Which is part of how he originally got accepted in academia, by being willing to talk about allied atrocities during the war. (It was still taboo in the West to acknowledge these into the later 1970s, and usually limited to the use of the atomic bombs since they were exclusively an American action.) He just took a bit of a while to get to why he wanted to talk about it in that it justifies Nazi crimes retroactively somehow.
The rest of the Irving cohort is hopping onto anyone, no matter how dubious their claims as to background are, making "scientific proofs" that make no sense like how there can't be anyone who was killed at Auschwitz because the doors on the gas chambers have no handles on the inside which means nobody could get out which makes no sense! Doors are made so people can go both ways!
Many academic Turkish-friendly takes on the Armenian Genocide use forms of either of these too. The former Yugoslavia/Soviet Union still has many people who were intimately involved hanging out (or even in power) so it's somewhat verboten to outright state that everyone during the break up tried to get away with something even if some were worse to far worse. For example, one sticking point with people I know from the area (both Bosnian and Serb) is how quickly the Croats got themselves out. They just assume they did something extra nefarious that the U.S. helped cover up. (Though to be fair, they also think know that 9/11 was a US/Mossad plot.)
