The dilemmas here are best illustrated by looking closely at pre-emptive war. It is a lesser evil because, according to our traditional understanding of war, the only justified resort to war is a response to actual aggression. But those standards are outdated. They were conceived for wars against states and their armies, not for wars against terrorists and suicide bombers. Against this kind of enemy, everyone can see that instead of waiting for terrorists to hit us, it makes sense to get our retaliation in first.

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...

Moral globalisation is best understood not as a tide of convergence in which we are swept together into a single modernity, but instead as a site of struggle over whether, and to what extent, the cash nexus can be made to serve moral imperatives of equity and justice and which civilisational model – Chinese, American, or some other rival’s – will define the order of the twenty-first century.

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.

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It was Reagan who began the realignment of American politics, making the Republicans into internationalist Jeffersonians with his speech in London at the Palace of Westminster in 1982, which led to the creation of the National Endowment for Democracy and the emergence of democracy promotion as a central goal of United States foreign policy.

The difference between us and terrorists is supposed to be that we play by these rules, even if they don't. No, I haven't forgotten Hiroshima and My Lai. The American way of war has often been brutal, but at least our warriors are supposed to fight with honor and can be punished if they don't. There is no warrior's honor among terrorists.

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We do need to ask ourselves, as a society, as a free people, how we came to this pass. Those soldiers were acting in the name of America, and they disgraced its name. We have to ask who authorized them to do so. Who should take responsibility here? We need answers to these questions, and we need to take responsibility as citizens that we get answers, and that accountability is established, right up the chain of command if need be, so that we do not go here again as a country.

There is only one thing we can do about this: live the way we are supposed to live, as our Constitution commands us to, with dignity and respect for all. Being an American is not easy. It is hard. We are required to keep some serious promises. We are judged by a high standard, one we crafted for ourselves in the founding documents of the republic, the ones that talk about the equality of all people, the ones that tell us that government is of the people, by the people and for the people. We need to live by this, at home and abroad, and it is just about the only thing we can do to face the hatred of those who want to destroy us. Our best defense is to stay true to who we are. Our best defense is to refuse to live in fear, of them, of ourselves, of anyone.

Some voices are calling on America to circle the wagons. Some are even saying that our enemies do worse, so we should respond in kind. The problem here is that this is America. This is a constitutional republic based on the rule of law and equal respect for all persons. We can’t pretend that we can bend the rules any which way. We made the rules for ourselves. We have to live by them.