because you want immense suffering to expand outward undefinitely, instead of being confined to one dot where there's a hopeful chance of it being put out?
On the other hand we have a chance to save the tens of billions of people who will live and die in the 21st century and experience genocide, starvation, disease, child abuse, imprisonment, other violence, etc. We're already doing it -- it's achievable. It can't wait for a Mars colony!
i don't follow. why do you think those horrible things wouldn't happen on an extraterrestrial colony?
Any opinion you or I have about how long Earth will remain viable is irrelevant. There's nothing else. Mars and every other body are not viable at all and we have no way to make them so.
Reminded me of https://www.youtube.com/watch?v=0O5h4enjrHw around the 2:30 mark.