> The meteor strike wiped out the dinosaurs, but not all life. Mars currently has no life. The strong implication is that, Earth post meteor strike would still be far, far, far more habitable for humans than Mars ever will be.

Sure, but nobody today is researching the technology to survive a post-dinosaur-meteor earth. If it gets developed at all that's due to our space programs and our desire to survive on the Moon and Mars. So unless we go there we won't survive the aftermath of that theoretical meteor.