Fallacy of grayness

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The fallacy of grayness is the idea that things which are "grey", i.e. not clearly one way or the other (good/bad, true/false) are all more or less equivalent. The fallacy lies in the fact that grey is not itself a third discrete choice; it is a range, within which things may be much closer to either absolute (e.g. almost certainly true, or almost certainly false) than they are to each other.


  • slippery slope: permitting something at the near (possibly tolerable) end of the "grey" area will lead inevitably to things at the far (intolerable) end
  • fallacy of moderation: another "calibration error" fallacy