We learn from our mistakes, not our successes.
Therefore, wisdom comes from making mistakes.
Ergo, being fools may have given us considerable wisdom.
I know that I have a butt load of wisdom in many areas that people who weren't fools don't have.
Also, I used to tell my students who had done something dumb(to lighten the load a little). There are three kinds of people in the world. One kind walk into low doorways and hit their heads and back up, lower their heads and try again. Then there are those who run into the door, back up and do it again, don't duck and run their heads into the door again, and the third kind watches the first two and ducks when he gets to the door. Now, we know you aren't in the last group, so it is just a matter of seeing which of the first two groups you belong in. Learn to duck.