Asteroids and Absurdity

Sasha Volokh explains why highly moralized versions of libertarianism are totally absurd:

On the other hand — and at the risk of confirming Mark Kleiman in his belief that libertarians are loopy — I don't speak for all libertarians, but I think there's a good case to be made that taxing people to protect the Earth from an asteroid, while within Congress's powers, is an illegitimate function of government from a moral perspective. I think it's O.K. to violate people's rights (e.g. through taxation) if the result is that you protect people's rights to some greater extent (e.g. through police, courts, the military). But it's not obvious to me that the Earth being hit by an asteroid (or, say, someone being hit by lightning or a falling tree) violates anyone's rights; if that's so, then I'm not sure I can justify preventing it through taxation.

Bryan Caplan once suggested the asteroid hypo to me as a reductio ad absurdum against my view. But a reductio ad absurdum doesn't work against someone who's willing to be absurd, and I may be willing to bite the bullet on this one.

I think this is a mistake about how a reductio works. The mere fact that Volokh is willing to bite this bullet has no real bearing on the fact that the conclusion is clearly false, and so the argument is either logically invalid or else proceeds from false premises. I'd say "false premises." The best liberal thinking—classical, modern, whatever—proceeds from broadly consequentialist ideas about making human beings better off.