Remember pressures. Any fiery, earth-destroying demon/alien would consider where we live to be incredibly inhospitable, on the grounds that if they actually come up here, they will explode. And not even nuclear-style "wipe out all life on Earth, ha ha ha!" type explosion, but just a dead-fiery-earth-destroying-demon/alien-making-a-short-lived-unpleasant-mess sort of explode. You wouldn't want to be standing right next to it, but on the grand earth-destroying scale it'd be barely a blip.