We Should Not Be The World's Police Dog
Julian Sanchez' thinking mirrors mine. He writes at Cato on "Libya, Limited Government, and Imperfect Duties":

Glenn Greenwald observes that we're hearing a familiar false dilemma from advocates of intervention in Libya--the same one that was trotted out so frequently in the run-up to the war in Iraq: Either you support American military action, or you must be indifferent to the suffering of civilians under Qadaffi. Bracket for a moment the obvious empirical questions about the general efficacy of bombs as reliable means of alleviating suffering. What I find striking is the background assumption that whether the United States military has a role to play here is taken to be a simple function of how much we care about other people's suffering. One obvious answer is that caring or not caring simply doesn't come into it: That the function of the U.S. military is to protect the vital interests of the United States, and that it is for this specific purpose that billions of tax dollars are extracted from American citizens, and for which young men and women have volunteered to risk their lives. It is not a general-purpose pool of resources to be drawn on for promoting desirable outcomes around the world.

A parallel argument is quite familiar on the domestic front, however. Pick any morally unattractive outcome or situation, and you will find someone ready to argue that if the federal government plausibly could do something to remedy it, then anyone who denies the federal government should act must simply be indifferent to the problem. My sense is that many more people tend to find this sort of argument convincing in domestic affairs precisely because we seem to have effectively abandoned the conception of the federal government as an entity with clear and defined powers and purposes.

And his thinking mirrors a Bastiat line I'm reminded of more and more these days -- that just because we don't think government should be doing a particular thing doesn't me we are opposed to it being done at all. Actually, I'll quote him:

"Socialism, like the ancient ideas from which it springs, confuses the distinction between government and society. As a result of this, every time we object to a thing being done by government, the socialists conclude that we object to its being done at all. We disapprove of state education. Then the socialists say that we are opposed to any education. We object to a state religion. Then the socialists say that we want no religion at all. We object to a state-enforced equality. Then they say that we are against equality. And so on, and so on. It is as if the socialists were to accuse us of not wanting persons to eat because we do not want the state to raise grain." -- Frédéric Bastiat (The Law)