The precautionary principle is already too conservative. You don't need to level up to a *speculative* precautionary principle.
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The importance of the precautionary principle depends on the risk landscape; it's a bad principle for portfolios w/ bounded losses
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Depends on values. If a physics expt has a 1% chance of ending world, 9% of inventing time travel, 90% nothing, I'd do it
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That's a values decision, and you think human survival is commensurable with time travel. But the third option is to wait a bit... 1/
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and see if there is a way to do the experiment off earth, or if we can refine our theoretical understanding first, etc.
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The point is, individual values will determine what people choose to do.
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Collective decision making involves coordinating between those values; policy, esp. global risk policy, should be set on that basis.

