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What do you guys think of the theories of Ernest Becker, and of the more modern terror management theory?
The basic argument as that many, if not all, human behaviors are the result of our knowledge of our own mortality and our instinct to deny and forget about it in order to seek some kind of literal or symbolic immortality (by living forever, or writing a famous book, etc.) Religion exists to tell us that it's okay to die, culture to make us forget about religion, so we don't examine it too closely or think about death in general (it can still be scary because the evolutionary instinct to survive is still there). This definition of "culture" applies to nearly every domain of human achievement, including this very website. Less wrong exists to raise users' self esteem or self-concept so that the feel some security in a symbolic kind of immortality (I'm rational, I'm a transhuminist--of course I'll survive!)
I suggest you read the links I gave above for further explanation. There have also been scientific studies on mortality salience (here's a review) which seem to support the theory.
Ah well. I do believe that I will die; the question is whether there will be the Third World War...