While this might sound like a good idea in theory, it would be a bad idea in practice.
Many people think that the government should simply leave the economy alone. They argue that, when the economy goes into a recession, it will pull itself out by natural means. If the government would simply leave the economy alone, we would still have good economic results without creating a huge government bureaucracy that would end up taking our tax dollars and burdening us with regulations.
However, this sounds better in theory than it would be in the real world. In the real world, the economy does not correct itself very quickly. If the government does not intervene, citizens might undergo years of hardship before the economy rebounds. This would cause unnecessary suffering to many people. If the government can prevent this by stimulating the economy, it has a duty to do so rather than letting people suffer while the economy fixes itself.