> The Earth is going to die one day. [...] If we wish to ensure the long-term survival of the only intelligent life in the universe that we know about (as well as the survival of all the other creatures on Earth, who don't have our knowledge) then adapting, exploring, and surviving in space is what we must do.

I think that's the gripe. We all wish to ensure our long-term survival, but worrying about becoming a multi-planetary species today —as we're polluting the earth at an unsustainable rate, as we're still fighting wars, as we loose millions a year to disease and as the possibility of higher education remains a privilege for few— sounds like making the wrong investment.