Ross Douthat has an excellent piece in the New York Times on the crisis in Egypt. It is clear and short in its explanation of what the chaos in Egypt means to the United States and of the difficulties of international politics in general. As Douthat explains:
The long-term consequences of a more populist and nationalistic Egypt might be better for the United States than the stasis of the Mubarak era, and the terrorism that it helped inspire. But then again they might be worse. There are devils behind every door.
Americans don't like to admit this. We take refuge in foreign policy systems: liberal internationalism or realpolitik, neoconservatism or noninterventionism. We have theories, and expect the facts to fall into line behind them. Support democracy, and stability will take care of itself. Don't meddle, and nobody will meddle with you. International institutions will keep the peace. No, balance-of-power politics will do it.
But history makes fools of us all.