It becomes almost a self-fulfilling prophecy in a way when all the media and entire establishment keeps telling the population which candidates are acceptable and which ones you shouldn't even bother paying attention to. It's not an accident that there's only two major parties and other viewpoints or parties have a hard time getting in debates and air time. Then you'll justify it by saying"those people don't have a chance, ignore them"
Truth is the big businesses want politicians that will pass laws that will crush their competitors or at the very least keep them competitive. The free market is fucking hard to survive in without government subsidies. You have to stay competitive at all times, with prices and services. New innovation and business models can whip you off the map. It's not a comfortable environment for almost any business. But it's good for the consumer and customers.

Politics is evil anyway. It's a giant auction and absurd popularity contest. It isn't about truth. It isn't about reason. So it's not a surprise the worst climb their way to the top.