This is a documentary film about Entartete Kunst, a.k.a the work that the Nazis labeled degenerate art. It's really fascinating what they considered degenerate. Who exactly labeled it that way and what became of the artists and their work? It's nothing new to have critics who dislike certain works, whether it be music, paintings, movies, plays, etc., but to destroy the works that are labeled degenerate is a different level of criticism.
Doing one of those pro/con lists on this topic would make for a pretty interesting conversation. The pros and cons of having all art destroyed if it's labeled degenerate. The cons would probably far outweigh the pros.