phoebe ayers wrote:
I am all in favor of seeing if we can change people's behavior in subtle ways; it will take many solutions all working together to fix blp's.
-- phoebe
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A very simple and non-controversial start might be to ask New Page patrolers, when they see a new unsourced BLP (or indeed any unsourced article) to put a polite message on the creator's talk page saying
"Thanks for your article [XYZ]. Wikipedia asks that all material be verifiable from reliable sources, it is important that readers and other users can check what's been writen. You don't seem to have told us the source you used for this article. Please can you edit the article to indicate what the source is? (Click here for help if you don't know how.) Unsourced material about living people may be removed if challenged."
That doesn't bite or threaten any newbies, although if established editors keep getting these on their talk pages, threats might be warranted.