Let's face it. If the accident is going to be that severe in a plane to warrant a helmet, you're gonna be pretty well fcuked anyhoo.
You have to be conscious to extract yourself, help extract others and administer first aid. An otherwise benign knock on the head that renders you unable to extract yourself from a ticking bomb is all it takes
So obviously a helmet will improve survivability of some accidents.
The rotor world has come to accept this, perhaps as it is a more hazardous occupation and one where there are now enough examples to prove the point.
In this case at least two survived the impact. We can speculate if the third survived the impact but was unconcous and unable to extract himself.
The mercy flight crash in Victoria earlier this year, where at least one passenger survived the impact, but later died, perhaps is an instance where helmets could have made a difference.
Remember it may be your passenger that rescues you, wouldn't you like to see them wearing a helmet?
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Mickjoebill