Exactly, there is a massive difference between a cycle and motorcycle helmet.
Unless I was going a stupid speed I wouldn't wear one ([url]https://www.youtube.com/watch?v=MFpex_V3O_I[/url])
I cannot stress this enough, wearing a helmet is not like wearing a seatbelt. The efficacy of the seatbelt is unequivocal, all the research points to it doing more harm than good (there are some studies which show that those suffering restraint have shoulder brusing, but largely conclude that that injury would be less worse than the impact that would have happened without one). Helmet usage the picture is much more murky with very contradictory evidence. There are very few countries with mandatory laws, Canada, Australia and NZ all show decreased cycle usage.
I suppose my biggest issue is that it "dangerizes" the activity which puts people off from partaking and the benefits are outstanding. It is less dangerous than gardening, and the health benefits are massive, it reduces pre-mature death for the user, lower absentism, better physical and mental health. Then if more people did it, it would reduce pollution (bad air quality is already killing people), reduce the cost to health services of being over weight and reduced heart problems. In fact the BCR is so high for cycling that a Coppenhagen study showed that the country actually profits from each mile cycled rather than being a cost.