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In this Nov. 24, 1933 file photo, some of nearly 5,000 unemployed people wait outside the State Labor Bureau which houses the State Temporary Employment Relief administration in New York. The epic hardship of the 1930s is the best-known depression in American history, but it doesn't necessarily take that kind of nightmare to trigger the D-word. (AP File Photo)

John Stuart Mill's classic essay "On Liberty" gives reasons why some people should not be taking over other people's decisions about their own lives. But professor Cass Sunstein of Harvard has given reasons to the contrary. He cites research showing "that people make a lot of mistakes, and that those mistakes can prove extremely damaging."

Sunstein is undoubtedly correct that "people make a lot of mistakes." Most of us can look back over our own lives and see many mistakes, including some that were very damaging.

What Sunstein does not tell us is what sort of creatures, other than people, are going to override our mistaken decisions for us. That is the key flaw in the theory and agenda of the left.

Implicit in the wide range of efforts on the left to get government to take over more of our decisions for us is the assumption that there is some superior class of people who are either wiser or nobler than the rest of us.

Yes, we all make mistakes. But do governments not make bigger and more catastrophic mistakes?

Think about the First World War, from which nations on both sides ended up worse off than before, after an unprecedented carnage that killed substantial fractions of whole younger generations and left millions starving amid the rubble of war.

Think about the Holocaust, and about other government slaughters of even more millions of innocent men, women and children under Communist governments in the Soviet Union and China.

Even in the United States, government policies in the 1930s led to crops being plowed under, thousands of little pigs being slaughtered and buried, and milk being poured down sewers, at a time when many Americans were suffering from hunger and diseases caused by malnutrition.

The Great Depression of the 1930s, in which millions of people were plunged into poverty in even the most prosperous nations, was needlessly prolonged by government policies now recognized in retrospect as foolish and irresponsible.

One of the key differences between mistakes that we make in our own lives and mistakes made by governments is that bad consequences force us to correct our own mistakes. But government officials cannot admit to making a mistake without jeopardizing their whole careers.

Can you imagine a president of the United States saying to the mothers of America, "I am sorry your sons were killed in a war I never should have gotten us into"?

What is even more relevant to Sunstein's desire to have our betters tell us how to live our lives, is that so many oppressive and even catastrophic government policies were cheered on by the intelligentsia.

Back in the 1930s, for example, totalitarianism was considered to be "the wave of the future" by much of the intelligentsia, not only in the totalitarian countries themselves but in democratic nations as well.

An even larger array of the intellectual elite in the 1930s opposed the efforts of Western democracies to respond to Hitler's massive military buildup with offsetting military defense buildups to deter Hitler or to defend themselves if deterrence failed.

"Disarmament" was the mantra of the day among the intelligentsia, often garnished with the suggestion that the Western democracies should "set an example" for other nations -- as if Nazi Germany or imperial Japan was likely to follow their example.

Too many among today's intellectual elite see themselves as our shepherds and us as their sheep. Tragically, too many of us are apparently willing to be sheep, in exchange for being taken care of, being relieved of the burdens of adult responsibility and being supplied with "free" stuff paid for by others.

Thomas Sowell is a senior fellow at the Hoover Institution, Stanford University.