Cyclintom, you said ""... it is impossible to build a helmet that will offer significant impact protection" Dr. George Shively, The Snell Memorial Foundation"
Look what it says right there in black and white on the... SNELL memorial foundation webpage... (which you can, btw, browse through to look up how they test helmets so you can begin to formulate your little story).
Why wear a helmet?
Auto racing, motorcycling, bicycling, skiing and any activity that incorporates speed, agility and a head all impose risks of head injury leading to death or permanent disability. Helmets are the single most effective means of preventing these injuries.
Snell Certification is your best assurance that your helmet will perform its most important function: save your life when all your judgment, skill and luck have failed to keep you from harm.
I've said this before, a helmet is absolutely USELESS until you start falling. (Well I do like the visor).