Why are Americans pessimistic and optimistic simultaneously?

It's a mystery:

A new AP-AOL News Poll finds that while most Americans said 2006 was a bad year for the country, three-fourths thought it had been a good one for them and their families. Seven in 10 Americans feel good about what 2007 will bring for the country, and nearly 90 percent are optimistic about the new year for them and their families.

A Washington Post-ABC News Poll found similar sentiments about 2007. More than 60 percent of the public said it would be a good year for protecting against terrorist attacks, the state of the national economy and “the way things are going in this country.”

By contrast, more than six in 10 Americans tell pollsters the country is on the “wrong track.” Bush’s polls ratings are reaching historical lows. And most Americans don’t think the U.S. is winning in Iraq, according to a variety of surveys.

It's just human nature, isn't it? And it's not a bad thing either. You feel suspicious and critical about the government -- and you should. But then, as a healthy, balanced person, you trust things will work out all right.