MeFi pointed this out, but the key posts to view are this Volokh Conspiracy post, wherein he notes that

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.

Our counterpoint is the Onion story with the following headline: Republicans Vote To Repeal Obama-Backed Bill That Would Destroy Asteroid Headed For Earth

A bit:

“The voters sent us to Washington to stand up for individual liberty, not big government,” Rep. Steve King (R-IA) said at a press conference. “Obama’s plan would take away citizens’ fundamental freedoms, forcing each of us into hastily built concrete bunkers and empowering the federal government to ration our access to food, water, and potassium iodide tablets while underground.”

“We believe that the decisions of how to deal with the massive asteroid are best left to the individual,” King added.

Don’t miss the sidebar summarizing either side’s arguments.