I'm well aware of the historiography. Historians don't agree. You wouldn't expect ideological conformity unless you had a top down system that would not tolerate any dissent from their political dogma. Which is exactly what exists in Academia today. It was not always so.
Broad denunciation of historians for ideological conformity is not the same as engagement on the facts. The most effective demolitions of Leftist historians are based on comparing what they say against what their cited sources actually say — or even showing that their claimed sources do not exist. One up and coming young antigun Leftist historian lost his teaching position over such a fraud and left the profession.