Violent moderation leads to people being annoyed, some questions, more moderation; a minor outrage, bans;amajor outrage spilling to social media, nuclear wipes. Damaged community, sometimes even dead community.
If you see a flamebait post, you delete it.
But if you see a question about where the original post go, and you delete it: then you just started a toxic flame war with your own hands.
And "guidelines" never help. When people are outraged they would not observe same rules they supported a day before. Sorry, not going to happen, so don't blame flame war on public.
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Edit: http://www.reddit.com/r/NewsForHackers/comments/v0f8u/overmo... is this worth discussing outside?