With all of that said... I have to say that honestly I don't care if someone wears a helmet or not. It's their life. Their head. It's not my place to tell them to protect it.
We let people ride motorcycles, legally, without a helmet. They drive 60-70-80+ mph, with a helmet. It's legal.
I don't care if that person chooses to wear a helmet or not.. and I don't care if a cyclist cares or not. Honestly.
My cycling club gets all in a huff about it, and no one is allowed to ride with us, without one... but I personally don't care.
But I did think it was funny that the lady was carrying her helmet on her bike and not wearing it. I also think it's equally funny with a see someone on a motorcycle doing that as well.
With all of that said... I wear a helmet at all times. I did when I rode motorcycles (for 2 years-no other transportation)... and I do it riding my bike.
"Life is not a journey to the grave with the intention of arriving safely in a pretty and well preserved body, but rather, to skid in broadside thoroughly used-up, totally worn out, and loudly proclaiming: WOW WHAT A RIDE!!!!"