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James_Miller comments on Wear a Helmet While Driving a Car - Less Wrong Discussion
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That seems reasonable.
For saving a life, but it still might help with preserving more of the brain for cryonics.
I wonder if a helmet would reduce the damage caused by an airbag.
I doubt it.
Ordinary helmets are thick. That isn't to make them stronger. Bicycle helmets are made of something like expanded polystyrene: you can push a fingernail into them. I've never worn a motorbike helmet, but they have thick padding inside.
The reason is to make space between your head and the impacting object, so that the impact forces are spread over a longer time as the helmet material deforms. Acceleration = force/time, so increasing the time reduces the acceleration.
A hard shell spreads the force of the blow over a larger area, but does nothing to reduce the acceleration.
An airbag already hits with a large area, so I don't think the Crasche would have any effect in that situation. It's a hard shell with thin padding, so I expect it is of some value against sharp objects and abrasions, but won't alleviate impact forces much. I wonder what their patent claims are.
To answer my own question, here are some of the patents. The claims consist of the design and method of making the protective inserts, not the sort or amount of protection it gives.