I dislike how much for Tolkien being good means the same thing as obeying the right authority. However, I think that his work does not really suffer much from this because he does not try to rub his moral attitude into the reader in the way that a cheap propagandist would. Unlike so many modern political writers of various ideological persuasions, he does not write paragraphs upon paragraphs trying to convince you, with all the nuance of a sledgehammer, that the bad guys are bad and that you yourself are bad if you disagree. He is more subtle than that. I would probably find his morality insufferable if he was not, given that so much of his worldview boils down to the idea that what is truly good is to serve and obey a god no matter how much suffering that god puts one through.

I also suspect that many of the people who accuse Tolkien of having too much of a black and white sort of morality would be offended if they read, for example, a history of World War 2 that humanized the Nazis. I understand the common criticism that he basically depicted entire races/species as being evil but after all, this is fantasy. Having read some of his letters, I doubt that he actually believed that there were any human ethnic groups that were essentially evil.