The radio program On the Media had a powerful program that looked at how differently the US and Germany deal with their ugly pasts. In Germany, there are memorials and reminders everywhere of the Nazi era with no attempt to hide the atrocities committed by them, all in the effort to make subsequent generations clearly aware that they as a people were capable of doing things like that and that they must be alert to avoid any repetition. But there are no memorials to the Nazi leaders, no statues or buildings or any other monuments named after them. In other words, the Nazi history is preserved and remembered but as a cautionary tale, not honored.
Contrast this with the US and its history of genocide of Native Americans and slavery. There are Americans who refuse to accept that these were abominable periods in US history that need to be unequivocally condemned and they even oppose the removal of monuments that honor the people who participated in those things. They refuse to see themselves as descendants of people who participated in unspeakably cruel acts and find ways to minimize and excuse the actions. They seem to think that acknowledging that the nation was capable of committing such atrocities will somehow devalue themselves now. As a result, the ugly history is minimized, distorted, or ignored.