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On Wikipedia, uncited information and information unfaithful to the cited references are not precious, nor can they be considered to be work of any value.
In the overwhelming majority of cases, adding unsourced information on Wikipedia amounts to nothing more than digital graffitis. Those unsourced additions can be due to users – among other things – forgetting to add a reference, adding something from memory they heard or read somewhere, joking, or trolling. Those additions have very real consequences outside of Wikipedia.
The removal of unsourced information is therefore completely and totally legitimate on Wikipedia: it improve articles by removing unverifiable information and prevents disinformation and misinformation from spreading.