I would ask this though, if we all have moments of uncertainty, of inability to do what is best for us, is the fool really the worst thing to play? Is swift action always better than quiet reflection while we regain our footing, just to ensure that we don't unwittingly play the fool? I'm not so sure, if die tomorrow and the worst thing anybody can say about me is that I was a fool for a portion of my life, I'll count myself blessed. Vigilance in not being the fool only leads to distrust and suspicion of all those around you.
In closing, I suggest supporting the fools in your life, loving and caring for them. The fools aren't the ones to fear and they aren't the ones who deserve your wrath. It may also be prudent to ensure that you have no fools of your own. People that support you more than you support them, people that are patient with you when they receive no self benefit from being so.
I'm pretty sure there's a string of fools behind me somewhere, it seems it's my turn to walk a mile in their shoes.