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It doesn't tell us anything and the "just coincidence" is the other side of a false dichotomy.
For it to begin to tell us anything, we would need to know a) the number of forumengers that you know that have been in cycling accidents, b) the percentage of those that were, or were not, wearing helmets during those accidents, c) the percentage of those accidents as a whole that led to a head injury, d) the percentage of those accidents that involved a cranial impact and e) the percentage of d) that actually led to a brain injury.
There are actually a whole range of other data points that would be useful in telling us anything. What you're presenting here is still anecdotal evidence. Without at least some credible degree of context to compare it to, it's fundamentally meaningless.
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The_Seldom_Killer
So, I have been on LFGSS for about 8 years. In that time I have known four forumengers suffer brain injuries in cycling accidents. On each occasion, the rider in question wasn't wearing a helmet.
Does this tell us anything or is it just coincidence? Genuine point for discussion.