Our government currently beleives that some companies are too big to allow to fail. That if they fail they will bring down the entire economy with them, or at the very least bring down their poll numbers due to unemployment temporarily going up by a point.
But what does it mean for a mega company to fail?
Take a look at the auto industry, we have a variety of newcommers, something unheard of in markets controlled by incumbants.
Companies like tesla motors are coming and providing niche products that the incumbants ignore... Remember when blockbuster was the giant and netflix was nothing? imagine the government decided to bail out blockbuster?
Big companies fail because they are mismanaged, because they have no vision, bad treatment of employees, unwanted products, and inability to change to fit a changing world.
By bailing out every company that is failing you are stomping on the innovator who take the market into the future by providing customers what they want. You cement incumbants to the detriment of consumers, technology, and the startup. And you destroy people's faith in the free market, preventing them from even trying to innovate. Why bother making a startup to provide something new, the government will just bail out your rich and powerful and stupid competitor.