The numbers indicate a large skew in the proportion of deaths by category vs the general pool of all injuries. If the data is consistent then it would indicate that middle aged men are more likely to have fatal vs non fatal head injuries than the general population.

Of course there could be differences in how the data were collected, and what criteria were used, but the fact is that head injury and fatality data do not make the case that head injury is a serious risk for casual cyclists. I won't debate whether helmets reduce the rate of injuries or make a difference is the severity, and I certainly have no basis to object if anyone chooses to wear a helmet for cycling or any other activity. That's a personal choice. All I ask is that the true believers do what they feel is best for them, and give others the courtesy of accepting their decision to do differently.