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Here's some rational reasons for why colonising Mars is a good idea (copy and pasted from an old comment of mine):

* It would be a challenge, and (as there is lots of historical evidence for) innovation comes from people working on hard problems. So it would lead to innovations

* It would inspire a generation to be more interested in areas like science and technology

* The fresh start of a new planet would provide the opportunity for people to try out new forms of social structure. The founding of the USA is a historical example of this. Broken systems and structures is a big problem on earth right now.

* Ultimately if humanity only exist on a single planet, then it's at great risk of being wiped out by some catastrophe. Getting off earth is important for our future existence.

(A long time ago, I read Robert Zubrin's "The Case for Mars" and I think a lot of these ideas came from that. https://www.amazon.com/Case-Mars-Plan-Settle-Planet/dp/14516...)

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