Let me rephrase that - if I, somehow, had to be in that accident again and fall head-first to the pavement, I would once again choose to be wearing a helmet, and I don't need a scientific research to make that choice. If you don't like that it's anecdotal - well, I can't help that.

And I think that hitting the pavement with the helmet instead of my head is indeed how the helmet should work, so it most certainly "works to some extent".

Unless you want to argue that I would have been just as fine hitting the ground at 25km/h without a helmet?

Or is your entire(and only) point that no one should ever mention anything they have ever experienced unless they can back it up by research by an approved institution?