"...advanced crash structure as in all modern cars..."
Actually the whole thing started when an aviator (Hugh DeHaven) survived a mid-air collision, and wondered why his opposite number didn't....
I certainly think that perhaps it is time to at least investigate design for crash survivability in light aircraft / helos. Amusingly, i spent some years as a crash design engineer (specialised in simulation, Rover 75) - interesting stuff, but not engines. Basically the biggest problem becomes how to package air! You need crush space to deccelerate "occupants" from impact speed to zero, while staying below 40g (assuming well restrained) - this is why you can generally wave your hand around the engine bay in NCAP compliant cars (ignoring plasticky stuff). The really clever bit is to have structure that is light, deforms progressively, and doesn't go to pieces if overloaded - this way even a real bad'un gives the guy a fighting chance...
At an interview with BAE, i was genuinely suprised that wings were not tested to absolute failure - i know of one 747 incident where crew pulled 7g out of a dive, but still landed one banana shaped Boeing...
Mart