Pulling the Lever in a Subway Problem

Eleven years ago, Jeff Kaufman pulled the emergency brake on a Boston subway train after witnessing what appeared to be a man's arm caught in the closing door as the train accelerated, potentially risking serious injury. However, upon reflection and input from other passengers who were closer to the scene, Kaufman now believes the man's arm was likely never actually caught—only his bag was—illustrating how real-world moral dilemmas differ fundamentally from philosophical thought experiments due to incomplete information and uncertainty about actual consequences.