Another question is why planes don't use fuel that is less likely to burn on impact, and the answer, of course, is money, not lack of technology because the safer alternative exists. Here are 2 more things that would make flying safer:
Parachutes for planes, which are available now for smaller planes, but are not yet technically feasible for larger planes (scroll down once you click the link to see article)
Link Arrester beds at the end of runways made of concrete that has dishwashing liquid mixed in:
Link
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