Omission Bias

What is it?

Omission bias is the tendency to judge harmful actions as morally worse than equally harmful omissions (failures to act). We feel less responsible for bad outcomes caused by inaction than by action, even when the consequences are identical. Classic thought experiments illustrate this: most people find it more acceptable to let someone die by not intervening than to actively cause their death, even when the outcome is the same. This bias has significant implications. In medicine, doctors may be more reluctant to recommend treatments that have known risks than to recommend inaction that produces the same statistical risk of harm. In organizations, managers may tolerate deteriorating situations (omission) while being unwilling to take actions that might cause comparable disruption. The bias likely evolved because actions are more traceable to individuals than omissions, creating greater social accountability. But it leads to suboptimal decisions when inaction is actually more harmful. Overcoming omission bias requires explicitly comparing the consequences of action versus inaction, recognizing that "doing nothing" is itself a choice with consequences, and accepting appropriate responsibility for outcomes we could have prevented.