I wear a helmet when I ride, if there really is no difference- I'd still choose to ride with one on my skull. Aside from bicycles and motorcycles, helmets in skateboarding also have no documented data or proof that they work better or not. Now, argueing whether a skateboarder should wear a helmet is irrevelent because it is their own free will whether to wear a helmet or not. I am a downhill/freestyle/pool/vert/longboarder skateboarder, and I can say through my own personal experiences that if I weren't wearing a helmet on my 60mph crash, or faceplant off a launch ramp, or my little fiasco in the Vans pool, I wouldn't be here to post this.

Your argument may be "you will never know unless you fall the exact same way without a helmet," or "my experiences with trauma will concur that helmets are not a necessity," that is great, but to me, a helmet has saved my life/wellbeing more than once on a board. That is why I choose to wear one on a bicycle and even skateboard. I wear my helmet to the store, school, or work, I do not plan on waking up dead for not wearing a helmet. Even if my argument is based off of my experiences from skateboarding, I can say gravity and physics will always have that set amount of force on your skull if you fall on a bike, skateboard, scooter, or shower. And with that I choose to wear a helmet.

(Apparently) Helmets are opinions without proof, and everyone is entitled to wear one or not.