The P(Doom) Paradox: Probability Estimates Themselves Change Society's Response

codytfenwick · x · 2026-09-25

A discussion about the limitations of "P(Doom)" as a construct. @binarybits argues that P(Doom) is not an independent, objective number: it depends on society's reaction function — P(Doom | status quo AI policy) is likely much higher than P(Doom | governments take decisive action), and the probability of decisive action at any moment depends partly on people's stated P(Doom).

codytfenwick generalizes: this afflicts nearly any probabilistic assessment — the assessment itself can affect the outcome. Nate Silver's election forecasts, for example, might motivate or demotivate voters enough to actually change the result; climate forecasts face the same issue. Still, he argues this complication doesn't undermine the utility of probabilistic thinking.

Related event: Why P(Doom) Is a Bad Question: It Depends on How Society Responds(3 posts)→

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