The rule of law might not seem always fair, but it hampers the powerful much more than the weak. As an example: None of the billionaires in my city have set up their own duchy pressed us into an army, enforcing their own laws. Their taxes, while not as high as I would like, in fact pay for much of our city budget including city services. Even the poor in my city have access to clean water and the library system.
Just because we have to fight to maintain the sanctity of the legal system and because every actor isn't perfect, does not mean that it's entirely corrupt and captive. I would ask you to take a moment to compare the current rule of law, rule of law in a developing country, and rule of law without the rights guarded by a nation-state.