Without discounting the problems you mention, and they are serious problems, the reason for colonization trumps all of those. Existential risk. Humanity is one virus/asteroid/x-type solar flare/etc. away from extinction at any given moment since we are all down the same gravity well. At sufficient timescales, the probability of extinction approaches 1. Colonizing Mars doesn’t do much to alleviate that risk, but it is a necessary first step to prepare for interstellar colonization.
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I assume he means the 2012 Karl Urban version. And seconded on Dredd as an excellent action movie.
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