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Telling a poster their link is a 404 can contribute positively by prompting them to find an alternate URL. Otherwise, how would they know?

It could save other readers the time of loading a link that isn't going to work? I thought it was contributing in that sense.

He was -3 when I commented originally.

How embarrassing, I fail at reading comprehension. I thought the question was "I don't understand why tomerico was downvoted", and that was what I attempted to answer. The source of my confusion was that aw3c2 had net positive votes, and tomerico had net negative.