Second guess

A second guess was to criticize someone's actions or decisions, usually after the event had happened, essentially looking back with hindsight to question if the choice made was the right one.

While talking with T'Pol, Hoshi Sato said to her, "I didn't ask for you to keep count of every time I make a mistake, or to second-guess all of my decisions." (ENT: "Vox Sola")