I think the monument decisions should lie with the owners of the properties they are situated on. But if they do choose to keep them, there should be a sign similar to this from the Looney Tunes DVD collections:
Looney Tunes DVD Disclaimer wrote:
The cartoons you are about to see are products of their time. They may depict some of the ethnic and racial prejudices that were commonplace in the U.S society. These depictions were wrong then and they are wrong today. While the following does not represent the Warner Bros. view of today's society, these cartoons are being presented as they were originally created, because to do otherwise would be the same as claiming that these prejudices never existed.
Basically, replace cartoons with statues.
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