Interesting to read the reasons given:
"It impairs your vision and it impairs your hearing and it fatigues you," James Parker, a service manager at Harley-Davidson Buell, said. "If you go riding 500 miles in a day and you have that helmet all day long, you're getting tired."
I can't agree with that. For me, the helmet provides a cosy chamber in winter and a relatively wind-free room in summer.
There are currently three states in the nation that do no have any sort of motorcycle helmet law: Illinois, Iowa and New Hampshire. Nineteen states and the District of Columbia require helmet usage for all motorcycle riders.
Utah is one of 18 states that requires helmets only for those under 18. One state (Delaware) requires helmets for those under 19 and eight states mandate helmet-usage for riders under 21. Florida has a law that allows those 21 and older to ride without a helmet if they have at least a $10,000 medical insurance policy.
Florida (and Michigan) are virtually admitting you will need more medical treatment after crashing without a helmet.
I know it's all about personal freedom in the States, but some protective gear seems sensible, to say the least.