Do you guys think public sentiment is such that people feel the risk of dying is far less than the risk of not going to Mars? 

Does a majority of society feel further outer space exploration is worth dying for

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I don’t think this is a good way of phrasing this. I wouldn’t die for space travel, but there will never be a shortage of exceptional people who would, and we should support and respect those people as much as we can

There’s a long history of people doing this and becoming an astronaut is very competitive?

Some might argue there is a shortage of these people, because everyone adopts your attitude of “not me” and assumes someone else will