rwallace comments on SIA won't doom you - Less Wrong
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It is strange how people still seem to think this argument has something to do with doomsday - when what it actually about is a failure to make progress towards galactic civilisation.
I've pointed this out several times now - and so far nobody has even attempted to make a case for terminal setbacks - rather than roadblocks. Doomsday makes for better headlines, I guess.
[Update 2010-11-05] - K.G. now discusses such an case in her thesis - available from: http://meteuphoric.wordpress.com/2010/11/02/anthropic-principles-agree-on-bigger-future-filters/
I have! http://lesswrong.com/lw/10n/why_safety_is_not_safe/
But basically, yes, I agree completely. I'm not convinced even by this version of the Doomsday Argument, not because I have a refutation to hand, but because the track record of this kind of philosophical reasoning in actually producing right answers is probably worse than random chance; that having been said, I can believe it could be valid, and that most intelligent species end up hamstringing themselves in the name of safety and spending all their energy on bickering about intra-species politics until their time runs out.