Unfortunately, in too many countries, calls for change have thus far been answered by violence. The most extreme example is Libya, where Muammar Qaddafi launched a war against his own people, promising to hunt them down like rats. As I said when the United States joined an international coalition to intervene, we cannot prevent every injustice perpetrated by a regime against its people, and we have learned from our experience in Iraq just how costly and difficult it is to try to impose regime change by force -- no matter how well-intentioned it may be.