2004 Nobel Laureate Edward Prescott in this WSJ ($) op-ed lays out five macroeconomic myths and observes as follows:

The sky is not falling. No need to panic and start playing around with all sorts of policy responses. Despite the impression created by some economic pundits, the U.S. economy is not a delicate little machine that needs to be fine-tuned with exact precision by benevolent policymakers to keep from breaking down. Rather, it is large and complex, with millions of people making billions of decisions every day to improve their lives, the lives of their families and the health of their businesses.
On the one hand, it’s difficult to screw up all these well-intentioned people by crafting bad policy, but, on the other hand, it is of course entirely possible to do so. And once things are broken, they are much harder to fix. For example, all those doomsayers predicting a recession will get their wish if taxes are suddenly raised, new productivity-strangling regulations are enacted, the U.S. turns against free trade, or some combination thereof. Otherwise, we should expect 3% real growth, based on 2% increases in productivity and 1% population growth. This economy is fundamentally sound.
So we have to be careful that we don’t believe everything we read in the papers. Things are never as bad as the last data that was released, nor are they as good. Likewise, policy should not be revised at every turn, nor rules changed by political whim. Meaning, we should be careful about accepting conventional wisdom as, well, being wise. One of the great disciplines of economics is that it challenges us to question status quo thinking.

In other words, it’s hard to screw up something as big and complex as the U.S. economy, but we’re eminently capable of doing it with unnecessary and ill-advised policy moves. And it’s much harder to correct the bad policy than to screw up in the first place. That’s a good reason to support this.