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You forget that astronauts were lining up to fly the Space Shuttle even after two of them exploded.

There will be no shortage of qualified volunteers for the first Mars mission, and the idea that people will go insane simply by being in a capsule for 9 months has been pretty much disproven by the recent Mars500 project.

There have been experiments that show we could probably make it without going insane. http://www.esa.int/SPECIALS/Mars500/

Dying of other random space hazards is still something to think about.

I think there are plenty of people (who arguably are not in their right mind) who would. Remember one million people is only 0.00014% of the global population.