Trump’s domestic and foreign policies — ranging from his attempted coup against the United States five years ago, to his incursion into Venezuela last weekend, to his current threats against Cuba, Colombia, and Greenland — undermine domestic and international law. But that’s not all.

They threaten what we mean by civilization.

The moral purpose of civilized society is to prevent the stronger from attacking and exploiting the weaker. Otherwise, we’d be permanently immersed in a brutish war in which only the fittest and most powerful could survive.

This principle lies at the center of America’s founding documents: the Declaration of Independence, the Constitution, and the Bill of Rights. It’s also the core of the post- World War II international order championed by the United States, including the UN Charter — emphasizing multilateralism, democracy, human rights, and the rule of law.

But it’s a fragile principle, easily violated by those who would exploit their power. Maintaining the principle requires that the powerful have enough integrity to abstain from seeking short-term wins, and that the rest of us hold them accountable if they don’t.

Every time people or corporations or countries that are richer and more powerful attack and exploit those that are not, the fabric of civilization frays. If such aggression is not contained, the fabric unravels. If not stopped, the world can descend into chaos and war. It has happened before.

We now inhabit a society and world grown vastly more unequal. Political and economic power are more concentrated than ever before. This invites the powerful to exploit the weaker because the powerful feel omnipotent.

Every time people or corporations or countries that are richer and more powerful attack and exploit those that are not, the fabric of civilization frays. If such aggression is not contained,........

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