An interesting debate as always and I really do hope it remains up to individuals to decide.
I do / have done four activities where helmets can come into play (ignoring work on construction sites)
Motorcycling - its the law, so always worn one whether its a 3 min journey to the paper shop or a 50 mile trip out in the hills. If it were not the law I`d go without the helmet on short hops about in the dry and daylight, but most likely put it on for longer trips or dark nights and wet roads.
Skiing - bit like cycling - not compulsary, but some snowboarders and skiers are beginning to wear them more often (sometimes as a style item I know) - a similar debate rages about awareness of surroundings and risk taking for the recreational skier - personally never worn a helmet skiing, but put helmets on the kids when they were young and first on the slopes - stopped that as soon as they got better then me, which took about 5 minutes!!
Kayaking - no laws governing what you wear - I enjoy a mixture here of flatter water river touring and adrenalin fueled white water (rapids, gorges and waterfalls). On flat water I tend to just wear a baseball cap to keep the sun off, but as the gradient picks up, the rocks get nearer the surface and the drops get bigger on goes the helmet. The trade of awareness is more than compensated for by surviving bouncing your head off rocks on the river bed and bank - the scrapes and scratches on both my kayak helmets bear testament to the protection I have receieved - without it I would have been unconcious and probably drowned.
Cycling - I have a helmet, but usually dont wear it. It goes on for dark nights, strong winds and wet roads when I percieve the ride is more risky. In daylight, dry conditions and good visibility my personal risk assessment is that Im safer and more comfortable without it.
My conclusion - not every trip, every activity or every day is the same. The levels of protection I use tends to be based on an informed decision about the levels of risk I`m facing. As an adult with reasonable intelligence I really hope the government continues to give me, and all of us, the freedom to continue to exercise that judgement.
All the best and stay safe
Bob_about