Handling of reviews hosted on the Ethereum blockchain

As part of a group academic project we are writing a DApp that will host reviews on the Ethereum blockchain. We have run into a problem regarding reviews that are slanderous or contain profanities. We were wondering how we could possibly still handle the moderation of such reviews while still maintaining the idea that the history of reviews cannot be changed/removed.

Has anyone had a similar problem to this, and did you manage to come up with a viable solution? Thanks.
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