> The point of colonizing Mars (for Musk) is not to move there when Earth becomes inhabitable. It's too remove the single point of failure for the species that Earth currently represents.

Fair point. However it's sad to think that as a species we're so petty and narrow-minded that we need a backup in case we fuck this planet up ourselves. Maybe I'm too harsh, but I almost feel that we don't even deserve a backup if we can't avoid a nuclear holocaust or environmental collapse here on Earth.