lessdazed comments on The Aliens have Landed! - Less Wrong
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Is there a standard name for the logical fallacy where you attempt a reductio ad absurdum but fail to notice that you're deriving the absurdity from more than one assumption? Why conclude that it's the caring about far-away strangers that is crazy, as opposed to the decision algorithm that says you should give in to extortions like this?
Hidden assumptions play a role similar to the auxiliary hypotheses which undermine naive Popperianism. The fallacy of ignoring auxiliary assumptions seems like a special case of the fallacy of presenting an argument from ignorance.