I totally 100% agree that the not wearing or wearing of helmets should, and must, remain a personal choice.
Personally I have read all the evidence, and factored in the facts that I have had three bike crashes in my life, two resulting in my head hitting the road within the limits on my helmet design. I therefore, until absolute convincing proof either way, will continue to wear one.
Note: I have walked, and driven, many many more miles than I have cycled and fallen / crashed on more than one occasion. To the best of my knowledge, on a grand total of zero occasions from these has my head hit a hard surface.
You may argue that my my head being enlarged by my helmet resulted in the impact however I counter-argue that due to both case me landing flat on my back at speed would have resulted in head impact anyway.
That is my experience in my (close to) 5 decades of life. Your's may differ and so may your choice. Life and let life.
I totally 100% agree that the wearing or not wearing of helmets should, and must, remain a personal choice.
My most recent serious cycling accident occurred about 7 years ago when a pedestrian who had been standing and gazing in the opposite direction suddenly ran in front of me, still looking in the opposite direction. I shouted "Look out!", braked (from ~18mph) and tried to swerve round him, but he carried on, making a collision impossible to avoid. Contact was with my my left hand, which was squeezing the brake lever. The bars were forced round, the front wheel collapsed, and I pivoted on my right elbow, the bike flew over me, and I landed flat on my back with feet pointing in the direction I'd been going. My head did not make contact with the ground; if I'd been wearing a helmet, I'm sure it would have, and I'd be one of the multitudes proclaiming to all the ignorant unconverted that a helmet had saved my life.
However, if I'd been wearing a helmet in an accident about 22 years ago, the more recent accident would not have taken place. How so? I hit a patch of spilled diesel on a fast right hand bend at about 25mph. The raised grid that ripped my jacket to shreds and damaged my right shoulder would in all likelihood have snagged a helmet. I'll leave you to imagine the potential consequences of that one.
Note: As a pedestrian, I have hit my head on a hard surface on many occasions, including slipping and banging my head on a tree when aged 9 (~6 stitches), being hit by a solid wooden boom when my brother chinese gybed his 30' trimaran (KO, concussion), walking into projecting rock in a tunnel while levada walking in Madeira, and contact with numerous low beams, one of which had a projecting nail. God how I wished I'd worn a helmet!
That is my experience in my 6 decades and a bit of life. Yours may differ and so may your choice. Live and let live.