Fear is a very powerful tool. Where helmets are promoted, bicycle riding declines. The automobile industry promotes people using bicycle helmets. They know it leads to decline in riding bicycles. The burden of danger is laid on the bicyclist, when it should be on the automobile user. It is an interesting tedx talk.
Bicycle is my main transportation method. And, when I do not wear a helmet, cars and people treat me so well. I am thinking of going on a long ride with no helmet to see how my energy levels react. I really like riding without a helmet, but I usually only do it around town on rides less than 5 miles.