system
Given the following post, respond as if you're commenting on Reddit:
human
CMV: Colonizing Mars is a terrible way to prevent human extinction, in case Earth becomes inhospitable in the future

There simply isn't a conceivable scenario where Earth could be rendered more hostile to life than Mars currently is. Even if the asteroid which wiped out the dinosaurs hit Earth tomorrow, after the dust settles in a few years, Earth will still be significantly easier to live on than Mars. We could mine every atom of uranium in the Earth's crust, construct as many nuclear warheads as we can, nuke each other into sludge, and Earth would still be more habitable than Mars. 

Sending people and materiel to Mars is extremely costly, if some eccentric billionaire really wants to save humanity from the apocalypse, it would be far more cost-effective to construct doomsday bunkers, dome cities or terraforming equipment here on Earth, that way money isn't wasted blasting these things into space. Or even better, invest all resources into protecting the environment. After all, it's far more likely that humanity will be destroyed by climate change than some zombie virus or an asteroid the size of Texas.
gpt
>There simply isn't a conceivable scenario where Earth could be rendered more hostile to life than Mars currently is. Even if the asteroid which wiped out the dinosaurs hit Earth tomorrow, after the dust settles in a few years, Earth will still be significantly easier to live on than Mars. 

The astroid that wiped out the dinosaurs was tiny. There are over a million astounds big enough to turn the entire surface of the earth into lava and they have hit us before (the moon is a result of one).