In Ross Douthat's column...

...today, "The Devil We Know," he makes a few points at the end that echo my distrust of ideologies of any kind (my emphasis):

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. We make deals with dictators, and reap the whirlwind of terrorism. We promote democracy, and watch Islamists gain power from Iraq to Palestine. We leap into humanitarian interventions, and get bloodied in Somalia. We stay out, and watch genocide engulf Rwanda. We intervene in Afghanistan and then depart, and watch the Taliban take over. We intervene in Afghanistan and stay, and end up trapped there, with no end in sight.

Sooner or later, the theories always fail. The world is too complicated for them, and too tragic. History has its upward arcs, but most crises require weighing unknowns against unknowns, and choosing between competing evils.