That's the question that libertarian law professor Randy Barnett asks in his op/ed today in the Wall Street Journal. A taste:
While all libertarians accept the principle of self-defense, and most accept the role of the U.S. government in defending U.S. territory, libertarian first principles of individual rights and the rule of law tell us little about what constitutes appropriate and effective self-defense after an attack. Devising a military defense strategy is a matter of judgment or prudence about which reasonable libertarians may differ greatly.
Many libertarians, and perhaps most libertarian intellectuals, opposed the war in Iraq even before its inception. They believed Saddam's regime neither directly threatened the U.S. nor harbored or supported the terrorist network responsible for Sept. 11. They also feared the risk of harmful, unintended consequences. Some may also have believed that since the U.S. was not attacked by the government of Iraq, any such war was aggressive rather than defensive in nature.
Other libertarians, however, supported the war in Iraq because they viewed it as part of a larger war of self-defense against Islamic jihadists who were organizationally independent of any government. They viewed radical Islamic fundamentalism as resulting in part from the corrupt dictatorial regimes that inhabit the Middle East, which have effectively repressed indigenous democratic reformers. Although opposed to nation building generally, these libertarians believed that a strategy of fomenting democratic regimes in the Middle East, as was done in Germany and Japan after World War II, might well be the best way to take the fight to the enemy rather than solely trying to ward off the next attack...
These libertarians are still rooting for success in Iraq because it would make Americans more safe, while defeat would greatly undermine the fight against those who declared war on the U.S. They are concerned that Americans may get the misleading impression that all libertarians oppose the Iraq war--as Ron Paul does--and even that libertarianism itself dictates opposition to this war. It would be a shame if this misinterpretation inhibited a wider acceptance of the libertarian principles that would promote the general welfare of the American people.
Hat tip to Reason Foundation co-founder Manny Klausner.