.....Hitler was (in my opinion) pure evil I' ll not dispute that.... but many people of not have unacceptable ideas....are in general put firmly into their place or ignored . ut on this occasion the concepts were interpreted and put into practice by those that surrounded him.--- How did it go the way it did? Like wisw the original thoughts of Engles/Marx et al could be said to be the perfect way- the pity was it was in revolutionary Russia they took hold and the brutal way of life of the Czars simply changed names- in other words nothing ready changed- only the perpetrators.
If art was only displayed because of the moral or ethics of a particular person or civilisation then I'm afraid you wouldn't have a lot to look at.
Just because he was a complete maniac and mass murderer doesn't stop his work being classed as art, the same as the Roman Coliseum is looked upon as a building worthy of keeping even though it was a place to slaughter thousands of people.
Throughout history art has been created by people who we know to have killed countless people, we still keep those items.
Or would it be better to behave as in the past and if you don't agree with some thing, destroy it.
is debatable - like beauty, it's often in the eye of the beholder. There is no reason why Hitler's paintings shouldn't be sold of course, like many other things they have a kind of historical significance. If paintings by say, Stalin, came up for auction I very much doubt that there would be any kind of a fuss, despite the fact that when it came to killing people Stalin made Hitler look like an amateur - at a conservative estimate Stalin masterminded the killing of some 20 million people.
Hitler was unquestionably an evil man,but like all very evil people he will continue to feature in the history books, and there will be those who wish to collect his works - books as well as paintings. There's nothing wrong with wanting to do so, although there will be those who try to infer that there is.