You can promote cycle helmets or you can promote bicycle use. Existing data shows you can’t have both.
The health and societal benefits are far greater when more people get onto bikes. A fall in illnesses like diabetes, heart disease and certain forms of cancer, a fall in obesity and a rise in productivity and life expectancy. Good for society. – from one of Mikael’s most important posts to date, at Copenhagenize.com
Personally I do think a slightly better wording of this message to spread is the “Helmet-free and safe” or even “[Not helmets.] Eliminate the danger at the source” suggested by some of the comment-leavers. But it’s the (promoting) thought that counts.