The dilemmas here are best illustrated by looking closely at pre-emptive war. It is a lesser evil because, according to our traditional understanding… - Michael Ignatieff

As a former denizen of Harvard, I’ve had to learn that a sense of reality doesn’t always flourish in elite institutions. It is the street virtue par excellence. Bus drivers can display a shrewder grasp of what’s what than Nobel Prize winners. The only way any of us can improve our grasp of reality is to confront the world every day and learn, mostly from our mistakes, what works and what doesn’t. Yet even lengthy experience can fail us in life and in politics. Experience can imprison decision-makers in worn-out solutions while blinding them to the untried remedy that does the trick.

To defeat evil, we may have to traffic in evils: indefinite detention of suspects, coercive interrogations, targeted assassinations, even pre-emptive war.

The Only cure for nihilism is for liberal democratic societies - their electorates, their judiciary, and their political leadership- to insist that force is legitimate only to the degree that it serves defensible political goals. Thus implies a constant exercise of due diligence...