Fix them, use them as examples of what not to do and do better.
You dwell on them, and they beat you.
You truely accidentally kill a man... You can beat yourself up for it for the rest of your life and contribute nothing to anything. Or you make ammends to the best of your ability. You buy groceries for the family, you put aside money for his children's college fund.
That is definately an apples vs hand gernades example, but it should drive the point home.
Experience is a brutal teacher, but you learn. My God, do you learn. - C.S. Lewis
Life is usually all about how you handle Plan B. - Jack3Beans
Listen without defending; Speak without offending - FaithinAK