Perhaps, but it should be measured. Discarding harmful traditions and such is good, forgetting what we did wrong is bad. I think museums are a great place for these. We certainly don't care for human sacrifice, but that doesn't stop us from putting ritual daggers on display from ancient civilizations. No sense in forgetting something important and having to learn it all again, and large objects that stand as a monument to bad decisions can be subverted to a good cause.

With big bold letters that say "SLAVERY IS BAD" for any museums located anywhere that uses the phrase "War of Northern Aggression".