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Besides, the appropriate answer is not to censor and hide, but to confront and refute. You want bad ideas to be catalogued and paired with their antidote, not let people remain blissfully unexposed, their mental immune system ready to overreact to the slightest provocation.

That is some of the ideas behind Marc Stiegler's "decision duel" idea in his book "David's Sling" [1]. He envisioned a system where two sides would lay out their arguments, and then the two duelists would link in arguments and counter-arguments to each point. This duel would occur with an audience watching, who would also contribute ideas and research to the duelists.

It is actually the right time to be able to implement something like this now, with the advent of WebGL and other browser technology for the presentation. I was just looking at another HN link about the 'wikigalaxy' visualization system which just hints at what is now possible.

[1] http://www.goodreads.com/book/show/3064877-david-s-sling