As I’ve pointed out here before, the Earth could be wiped out by any number of things and right now all of our eggs are in one basket. That’s why it’s valuable to get off of the planet. But thanks to the “forward looking” Obama administration, which has been cutting funding to NASA among other things, it’s become more likely that we’ll wind up living in caves rather than on other planets.
Using small asteroids to destroy every last one of our enemies — making it look like an accident of course — seems like the best of all space program spinoffs.