I always wear a helmet because at the end of the day it has zero effect on how I ride, so I can't come up with a single reason to not wear one but I can come up with a million reasons to wear one! You know, I sometimes hear people say their helmet is too hot or it's too heavy and that's why they prefer to not wear one ... then buy a different helmet! With that said, wearing a helmet will not always protect you from serious injury and/or death but I'd rather take my chances wearing one than not.
For me it's kind of like wearing a seat belt, it's a no brainer. Just this morning two people were almost killed near me when they were ejected from their car after an accident. No seat belts, of course. I would love to sit down with them in their hospital room and ask if they still think seat belts are uncomfortable enough to warrant not wearing them. The same logic applies to wearing a helmet. Everything is fine until you fall off and split your head open then people tend to smarten up... but unfortunately for some it's too late.
The hardest part isn't finding what we need to be, it's being content with who we are.