The most astonishing thing about the worst Nazis is that they were incapable of perceiving their actions as monstrous atrocities and crimes. Given that context, this letter was hopeless from the start.
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People who don't deny such things would not be Nazis for long.
(At least in my country,) I think there is still a majority of people that are very reasonable and to resolve issues through dialogue. But given the former, they stay out of debates and the whole discourse is dominated by the extremes.
That's not incidental, it's intentional - a tactic well-known and practiced by people trying to radicalize society. People need to stand up for the things they believe, in the same way Dr. King would emphasize that he wasn't passive at all, that he was a warrior who created real tension and pressure.
But I think the 'both sides' isn't born out factually. One side controls governments, including the most powerful one soon. They control business, international affairs, much of social media, etc. They are fighting wars of conquest. The other side has no power anywhere.