Remember kids... always wear a helmet. (The almighty bikeradar helmet thread)

It's perfectly clear that wearing a helmet makes people take more risks, or at least alters their behaviour when you see the number of people who say things like "I would never ride without a helmet"

Which clearly means that wearing a helmet has made them decide it is now safe enough to ride their bikes, whereas without they consider it too dangerous.

If that is not risk compensation I don't know what is.

It means that they are risk averse and if they are going to take part in an activity with a level of risk then they intend to minimise that risk whilst doing so.

Some pedestrians looks both ways before crossing the road and don't jay walk. Does it make being a pedestrian 100% safe? No. Its the same form of risk management.