@hierarchon

That does seem to be how trolley problems work out in reality: always something *else* happens.

someweekendreading.blog/two-tr

Or, as Graf von Moltke the Elder put it:

“In war you will generally find that the enemy has at any time three courses of action open to him. Of those three, he will invariably choose the fourth.”
— Helmuth von Moltke the Elder (quoted in “Hunting for Foxes: Capturing the Potential of Outlier Ideas in the Intelligence Community” by C Watts & J Brennan, in the CIA journal Studies in Intelligence 55:4 (2012), via Bruce Schneier)