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This is a bad argument because it could be used to rationalize preventing any progress whatsoever.

I am not sure what resetting history has to do with progress. I would not be against a new nude statue.

In this case, the progress is “we learned that censoring nude statues is wrong, so we stopped doing it.”

Would keeping slaves as a reminder of the evils of slavery make sense?

That statement applies exactly to both censorship and decensorship.