I always wear one out of habit.

Two years ago, I was riding by myself in a state park during the off season. I was on a flat, grassy trail, and no, I don't have a better story. What happened next, I can't tell you. I do know that I crashed hard...hard enough to get knocked out for a little over an hour, break the rear 1/4 of my helmet, and break my scapula. I somehow managed to make it 10 miles back to my friends place, and she took me to the hospital. I would say the helmet did a good job, and that is why I wear one.