I'm been told by plenty of people that I'm a loon with crazy political views (Tea Party family members mostly), but if I was working on an interesting tech. project, and wanted to do a talk at a tech. conference about it, I'd hope that wouldn't be a factor in conference organizers rejecting me.
If I'd started a political party founded on ideals of illiberalism, dictatorship, and subjugation of the people I hated and worked to gain political power in the US, then I'd say not accepting me at a conference could be more easily justified as the conference would then become a political platform for me regardless of what the talk was about.
In Hungary after the government change they saved a whole bunch of communist statues that were being taken down and made a museum out of it. I think it's interesting and worth seeing.
The fact that a horrible, unconscionable, genocidal dictator was also a painter makes his paintings more interesting, if anything.