Here in the US, like they said, I think only 2/3's of the states have Helmet laws for ADULTS. Most still have some sort of EYE protection laws, either a windscreen, faceshield, sunglasses........
I live in a state where ADULTS don't have to wear helmets.
About a mile away, you can cross a bridge into Georgia, which has helmet laws.
I run back and forth across the river into GA pretty often. It's like a mile away....
There's a gas station on the SC side of the river where you'll see the cruiser guys stopping to either take off those damn oppressive beanie helmets they favor as they come into SC, or putting them on before they cross the bridge to GA.
If they aren't straying into GA, 90% of the riders around here, whether it's a Harley, or a Hayabusa, are wearing shorts, sneakers, tee shirt...and not much else.
It's all about 'freedom', you know....
The freedom to leave your brains all over the pavement....
the freedom to leave a permanent grease spot where you slid on the pavement....
the freedom to walk funny the rest of your life, if you survive...
the freedom to make things tougher for the rest of us riders!