I like having the choice. Now that I am not as indestructible as I once was I chose to wear one....I would say 95 percent of the time. I don't care to castigate someone who chooses differently. On another thread it was said anyone who doesn't wear a full face helmet is stupid....so now it has to be the "right" kind of helmet.
When I was doing long cross country trips I would wear my helmet when required and when not required take it off if conditions were nice. I was comfortable not wearing one. One of the best memories of my helmet was having it strapped to the side of my bike filled with wild blackberries I picked in California.
One night I was glad I was wearing it as I came through a low wetland area thick with bugs and had to stop at a gas station and use the squeegee to clean off the visor, the headlight, and even my jacket.
I am sure I have many many thousands of miles without wearing one....high mountain passes.....winding coastal roads....wide open plains.....a wonderful experience....not one I would change or trade with anyone. Probably would not do it that way now but I am glad I did it and made it through in one piece. The only serious accident was being hit by a car and I was not wearing a helmet. Didn't smash my melon but broke a collarbone and wrist. Some would say I was lucky....me, it's just something that happened. I did start wearing one more often after that though, a wake up call I guess you could say.
Now the thing that really bugs me is those squids with the young girls on the back in shorts, tank tops, and flip flops. Or maybe it's just the young girls.....