We are not only talking about dying in accidents, hitting your head on the ceiling can still hurt a lot. The risk does not only come from meeting planes, it can also be natural turbulence that you get no warning for.
The reasons there are less accidents in the planes is not because they are inherently more safe (ever read up how helicopters work?), it comes from the rigorous rules around everything flying. The rules exists mostly because something happened and the industry set rules to make it not happen again.
You wear helmets on construction sites because the risk of something falling on your head is so much higher when people are working with loose tools in high altitudes, hanging from ropes or whatever. (And the company is responsible for your safety so will protect their asses from getting sued.)
The reasons there are less accidents in the planes is not because they are inherently more safe (ever read up how helicopters work?), it comes from the rigorous rules around everything flying. The rules exists mostly because something happened and the industry set rules to make it not happen again.
You wear helmets on construction sites because the risk of something falling on your head is so much higher when people are working with loose tools in high altitudes, hanging from ropes or whatever. (And the company is responsible for your safety so will protect their asses from getting sued.)