FaustoV posted a comment on http://www.scp-wiki.net/scp-14682-j in response to a quote reading "As far as I can tell, this was originally posted by Kode47 to r/LatvianJokes on Reddit".
I sent him the following PM:
You asked:
> May I use [potential plagiarism] as an excuse to downvote?
Please only vote on the merits of the article itself, not outside factors (per Site Rules). If it's plagiarized, we'll certainly end up deleting it regardless. Thank you.
~ Moose
I am of the opinion that possible (not even confirmed, at the time) plagiarism isn't a reason to specifically downvote an article that you would otherwise not downvote, and while it's in a grey area (and therefore I felt didn't merit a specific warning), that kind of group behavior is not something we want to encourage.