I am not seeing what you mean to say. Will starting a costly Mars settlement dependent on Earth for resources prevent these asteroids? Isn't a self sufficient p

I am not seeing what you mean to say. Will starting a costly Mars settlement dependent on Earth for resources prevent these asteroids? Isn't a self sufficient pod on Earth/space/moon much easier starting point? Isn't a nuclear bunker under the Earth as safe from these calamities as a settlement on Mars itself? Finally, I don't think a meteor which wiped out dinosaurs will wipe out humans. We can always use a nuclear bunker and save a few hundred humans with years of food to survive on.