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for ongoing cleanup projects.
Something like this:
"Hi, I noticed you removed some red links on [insert page here]. You may not be aware of this, but works without a page actually should be redlinked to encourage someone to create the page. Thanks for your attention."
Nice and polite and they'll usually happily revert their own edits.
Edited by DracMonsterThat redlinks to works are ok is mentioned on, fittingly, Red Link, but I don't think it's spelled out as a rule anywhere else.

I have long thought it appropriate to add links for works which I think would be worth creating a page for (and which all too rarely ever get one). These red links often get removed by other tropers, and I myself have been warned that doing so is against wiki policy, though I don't think there's any Administrivia page where this policy is stated outright. If removing red links to works that could be summarized is considered harmful, how would it be best to notify tropers guilty of it? There is no standard Issue Helper message for this, and I would hesitate to write one up myself.