I mean the US isn’t the definition of capitalism. It’s just one hundreds of examples. There are other countries that do capitalism way better like Denmark for example.

Also a big part of capitalism is the idea that different factions will compete for influence. The idea is that the different fingers of the invisible hand (the government, the public, capitalists, corporations, institutions, NGOs, the media, etc) are going to keep each other in check. If tension breaks and things fall out of balance then you basically get a dystopia. That’s why checks and balancing is one of the most crucial things to any successful capitalist system. It’s also the reason why capitalism in the US is heading down the wrong direction. Money in politics has thrown everything out of whack.