I wear one because it's law in my state. I find for a short ride (the closest gas station is 1/5th of a mile round trip) the helmet, vest, gloves, etc is a bit much for less than 5 minutes. Personally I'd rather the choice rather be made to wear one. My dad first started riding in Connecticut where there is no helmet law, so for him it's just what he grew up with.

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"BOY: On a hot summer night, would you offer your throat to the wolf with the red roses? GIRL: Will he offer me his mouth? BOY: Yes. GIRL: Will he offer me his teeth? BOY: Yes. GIRL: Will he offer me his jaws? BOY: Yes. GIRL: Will he offer me his hunger? BOY: Yes. GIRL: Again, will he offer me his hunger? BOY: Yes! GIRL: Yes. BOY: On a hot summer night, would you offer your throat to the wolf with the red roses? GIRL: Yes. BOY: I bet you say that to all the boys!" -Meatloaf