No ;; Regrets

Mankind was concocted with a brain purposely.
We live ;; we breathe ;; we think ;; we conclude :: All on our own.
Every decision was a concious one.
Believing something to be a mistake or seen as regretful is one of the most scapegoated verdicts we could conjure for our laziness to acknowledge we have made an unwise decision.
Why regret what's in the past?
Why not use it as a chance to progress and learn?