I would think that the Holocaust was carried out in living memory would be reason enough why it takes precedence over ancient acts of genocide.
Furthermore, the Holocaust was not a military program designed to defeat an enemy, if anything it was a drain on military resources against a segment of the population in both the 'homeland' and conquered territories, based on a conspiracy theory. There is absolutely no concievable military gain from such an internally directed and selective program of genocide whatsoever. Following that logic, there would be sound military reasons for rounding up Poles, Czechs, Russians, the Frenc and British en masse.
If anything, the holocaust is reminiscent of the pogroms before the Crusades. A bizzare and murderous display of 'purity' and eliminationism, to root out weak elements who were like a virus in the nation, according to the 'logic' of such actions. And, strangely enough, this was justified on the old blood libel theory....the idea that Christians were the victims of Jewish perfidy.