Noam Chomsky would say - have you being paying attention? In a “capitalist society” the real power lies with the rich. The clue is in the name.

The political leaders are controlled by the rich, because they rely on their money, so your idea that the people can vote for a better politician is incorrect - nearly all the time, the winning candidates are essentially chosen by the rich.

That’s Chomsky anyway, I’m reading him at the moment, but it’s hard to argue against.