This is an interesting, rather complex topic. I have somewhat mixed views on it.
I make my living teaching history, and I don't believe in leaving out the "bad parts." I build models for fun, and I try to make them as accurate as I can. My very small aircraft collection includes a BF-109 with swastikas on it.
My biggest interest is ship modeling. I build the subjects that interest me. I've always found it ironic that two of the most oppressive, sadistic regimes of the twentieth century, Nazi Germany and the Soviet Union, built some of the century's best-looking warships. I wouldn't hesitate to build a model of any of those ships. I don't, on the other hand, have any desire to build a model of a whaleship. What those ships did to justify their existence disgusts me. But there's no doubt that whaling was a vital part of the American economy for a long time, a major part of American culture, and an important part of history. Any museum ship model collection that's intended to be comprehensive and doesn't include a whaler is missing something important. And I support the preservation of the Charles W. Morgan a hundred percent.
I also don't believe in deliberately offending people. Being a transplanted Yankee living in North Carolina, I've seen the Confederate flag used too many times (usually by white people who know next to nothing about the Civil War) as a means of baiting black people. I find that kind of behavior contemptible.
Years ago I heard about a diorama that showed up at the IPMS Nationals: a detailed 1/32 reproduction of a Nazi Party rally, complete with Hitler, all the party leaders, banners, eagles, and a sound system that blasted out Nazi songs all over the contest room. A Jewish modeler objected. I don't blame him. They resolved the matter by leaving the diorama where it was, but shutting off the sound effects. I thought that was an ok solution.
I also remember a pair of jerks who came in the hobby shop where I used to work. They built nothing but German WWII armor and aircraft. (One day one of them showed up with a P-47 plastered with iron crosses and swastikas. He explained, with a smirk on his face, that "it got liberated.") Their modeling skills were downright primitive, and a few minutes' conversation established that they had only a vague notion of what Nazism was. To my notion those guys were sick - and pathetic.
I was once thinking about building a model of a pretty little Chesapeake Bay passenger steamer. I had lots of photos of her. In several of those photos, big signs saying "Colored Restrooms" and "Colored Passenger Lounge" were pretty conspicuous. I took the photos to the next meeting of our model club. I asked one of the members, who was African-American, "John, if I build this model and put those signs on it, will you find them offensive?" He laughed, and then said. "No. But I'd be offended if you left them off. They're history."
'Nuff said.