Decisions are in our control; outcomes are not.

Only DECISIONS are in our control. OUTCOMES are not. Focus on making the right decisions, and move on. The rest is in universe's hands.

(This is a version of the "Business Judgment Rule" as applied to life! If management made a reasonable decision based on the available information at the time of the decision, that's all that matters -- you cannot judge them looking backwards, by imputing incompetence based on the outcome.)