How do they escape the reality that the Earth will one day be destroyed, and that it's almost certainly impossible to ever colonize another planetary system? Just suicide out?
If you value maximizing the number of human lives that are lived, then even “almost certainly impossible” is enough to justify focusing a huge amount of effort on that. Maybe interstellar colonization is a one in a million shot, but it would multiply the number of human lives by billions or trillions or more.
Is the argument that we should try to do things that will benefit our theoretical and theoretically multitudinous descendants? Or is it that just taking action to make their existence more likely is a moral good? Because the latter is just brain dead.
Good question. I think it has to be the latter, given the immense time involved. You can make a connection between driving progress in certain areas today and increasing the odds that humanity eventually colonizes the stars. I don’t think you can make any connection with how well off those far-future humans will be.
