Several days into a campaign of air and sea strikes against Libya, I agree with many of the arguments from critics of the intervention: President Obama acted imprudently in committing American forces to a conflict with an ill-defined national security justification. It is unclear how, on balance, a third war in a Muslim country helps our foreign policy goals. It is uncertain that the intervention will produce a regime more to our liking than Qaddafi's. It is hard to justify military action in Libya while the United States does not use military force in the face of brutal crackdowns by...