I previously missed this column by Jim Pinkerton at TechCentralStation from December 31st (thanks to Ralph Buttigieg for the link). Though he's generally a political commentator, he's a closet space enthusiast (I met him briefly at the Cato conference last spring). This is a general piece about space policy, some of which I agree with (though not his assessment of Dan Goldin), but I cite it because he expends quite a bit of it on the asteroid defense issue.

He claims that it is not a NASA responsibility, but a DoD one. I agree, with the caveat that it shouldn't even be viewed as planetary defense per se. The DoD should definitely be in charge of defending us against willful agents (i.e., bug-eyed monsters from Zeta Reticula, or Marvin the Martian and his disintegrator ray), but not natural events.

No, the natural terrestrial analogue for asteroid management is flood control, or fire control. Thus, I believe that it should be made the responsibility of the Corps of Engineers. When the populace lies in a flood plain, they build dams to mitigate the danger. When earth lies in the path of potential planet-busting objects, they should land things on them to divert them. Taking NASA out of the picture would have the effect of forcing an emphasis on more practical solutions, rather than "science," or "international cooperation," or endless "technology development" that only feeds sandboxes in Huntsville or Hampton.

Also, as Ralph points out, it would provide NASA with some useful and much-needed competition.

This needs to be thrown into the space policy mix with which Sean O'Keefe is grappling right now.