Typical. You demand others provide evidence to support their claims, yet won't do the same yourself. That really doesn't seem fair.
There is a difference of scale and importance
Stating that helmets offer facial protection is on s completely different scale
As above, I am on a bus at the moment with interrmittent signal
I amquite happy to run a search when I get home later this evening to prove the point
You could simply search Geraint
A orime example of how in a helmets thread the professionals are used to justify helmets for the average cyclist
Again, I can ink when I get home later