hey aero junkie
"Well after surviving a crash, you also have to avoid breathing in carbon fibre particles and (if a fire happens) composite material burning in Jet fuel, both not good for the human body."
plane crashes in and of themselves are not very good for the human body, and all the safety devices in the world aren't going to help anyone.
we all know that the sardines in the back of the airplane cant breath un pressurized oxygen at 36000ft. if there is a depressurization, the pilots' job is to land a plane with a whole bunch of either dead or brain-damaged passengers.
also, the life jackets are only intended to help rescuers find the corpses of the passengers in the "unlikely event of an emergency landing on water"... no one is going to survive that...
the fact that no one died in the China Air fire is probably better classed as "miracle" than "luck".