The thing I would say is that I don’t think referring to leaders who implemented genocidal policies as terrible leaders or terrible people is an oversimplification of history. Now of course there is more context for why they did all the terrible things they did, but no one genuinely interested in the context would think that the initial conclusion that they were just terrible people somehow prevents a reasonable discussion. When we’re talking about people who were involved in a genocide, there is no reason to oppose characterization of the people who oversaw murder and abuse as terrible people.
I actually don’t see a real difference between making an argument that dismisses the importance of genocide and has some caveats and being a genocide minimizer.
Also, I have talked to regular American white people and conservatives, and they generally don’t talk like MH does at all. Frankly in real life I’ve heard the attempt to bound discussion to a narrow “reasonable” range of acceptable opinion from liberals.
The things I hear more from white conservatives are things like “no it’s OK they’re gonna put a black woman on a dollar bill” or “why is this my problem?”