As citizens of a free society, we have a duty to look critically at our world. But if we think we know what is wrong, we must act upon that knowledge.

We have responsibilities for others, not just across space but across time. We have responsibilities to people who came before us. They left us a world of institutions, ideas or possibilities for which we, in turn, owe them something. One of the things we owe them is not to squander them.

I worry that we have forgotten that the de-ideologized, de-politicized, uncontentious public space of the last 50 years as Europeans have experienced it is not the normal human condition. We shall be sorry to have abandoned a little too quickly the institutions that were set up by our parents and grandparents to protect themselves against a return of the bad old world. Because the bad old world can still come back to haunt you.

Although the United States lost a quarter of a million men and women, civilians and soldiers, in World War II, that's considerably less than the Russians lost in soldiers at the Battle of Stalingrad alone. It's important to convey to countries and to people and to generations who have no experience of the 20th century as it was lived in Europe just how catastrophic it was.

If we have learned nothing else from the 20th century, we should at least have grasped that the more perfect the answer, the more terrifying its consequences. Incremental improvements upon unsatisfactory circumstances are the best that we can hope for, and probably all we should seek.

As citizens of a free society, we have a duty to look critically at our world. But if we think we know what is wrong, we must act upon that knowledge.

We need to start talking about inequality again; we need to start talking about the inequities and unfairnesses and the injustices of an excessively divided society, divided by wealth, by opportunity, by outcome, by assets and so forth.