That sounds like an awful experience. From the picture, it looks like the crumple zones on the car yielded very kindly to your momentum as well, which is incredibly fortunate. I'm glad you got out of it alive, if with some serious scratches and dings.
I'm convinced anyone who would be wearing a helmet when driving a car, and narrowly escaping death in a similar way (e.g. a racing driver who is kept alive by their helmet?) would argue much the same way in favour of helmets when driving cars. It's just more rare because we don't wear helmets when driving cars.
My uninformed guess would be that many head injuries in cars would not be helped by wearing a helmet. G-force related injuries, like whiplash, and being hit by the airbag.
It’s a hard line to draw. I remember reading a comment on HN a while ago. In it the commenter said that whenever he left the house he wore earplugs, and protective glasses. Earplugs because he got a bit of tinnitus once, and the glasses, because once he almost walked into a tree branch and almost lost an eye. He’d probably say that we should wear a helmet no matter where we are or what we’re doing.
I'm convinced anyone who would be wearing a helmet when driving a car, and narrowly escaping death in a similar way (e.g. a racing driver who is kept alive by their helmet?) would argue much the same way in favour of helmets when driving cars. It's just more rare because we don't wear helmets when driving cars.
What do you think of that line of reasoning?