It's not even art, it's an artifact. In 1000 years, people will still be talking about Hitler. He's not the kind of guy to just fade into historical obscurity. What survives to that time, no matter how irrelevant, will be priceless.

No one's sitting around saying: "I wish Ghengis Khan would have left less shit for us to study,' but, no, some museum probably has a comb of his or whatever. I say we save the painting and let history decide.