A stronger view holds that Workman may not even harmlessly prevent the five’s being saved, and may not kill Engineer to save himself even after the five are saved (Frowe 2018: 476–478). Frowe argues that agents are typically required to act on lesser-evil justifications for defending others. If morality requires Engineer to divert the trolley, it cannot also permit Workman to prevent the trolley’s being diverted. And since Engineer is not liable to be killed, and killing her is not the lesser evil, it is impermissible for Workman to kill Engineer to save his own life.