outcome bias

You judge the morality of acts by the outcome.

Outcome bias makes people judge a decision by its eventual outcome rather than the quality of the decision at the time it was made.

The term for this phenomenon is 'outcome bias', not 'consequentialist bias'.

Your moral code is written by the winners.

Where this comes from

Study: Baron and Hershey, 1988, Journal of Personality and Social Psychology
What the check found: The study described exists and correctly identifies the effect, but the term 'consequentialist bias' is non-standard. The term 'outcome bias' is the established technical definition.
Confidence: Solid, with limits

One of these every day, and every one names the study it came from. When a finding is contested, it says so.