Cold logic is my name for reasoning that follows a principle past the point where it stops serving people: uncompromising, internally consistent, and blind to emotion, flaw, and circumstance. It reduces lives to variables and treats efficiency as the only virtue, and it is seductive precisely because it looks unassailable on paper. The idea is not new. J. J. C. Smart called following a rule even when breaking it would be better “superstitious rule worship”, and Max Weber separated reasoning about means from reasoning about ends. The eugenics movement is the clearest case: sterilization programs rationalized as improvement, with the suffering they caused left out of the sum.
The opposite failure is real too. Warm sentiment, decisions made purely from feeling, produces its own chaos and harm. I see the two as ends of one spectrum: lean cold for safety-critical and technical decisions where emotion clouds judgment, lean warm for relationships and community where compassion is the point, and remember that even the most rational framework has to stay tethered to the people it governs. Applied to public figures, cold logic describes a position, never a person, which is how libertarianism gets handled on this site.