I'm perfectly happy for some folks to have trillion dollar net worth. I'm glad to negotiate with these folks and their organizations to provide value in exchange for a comfortable living.
> just buy the government they want
The idea of a constitution and separation of powers is to constrain the types of government that can legitimately exist. This does work to some degree. No matter how wealthy you are, you can't kill people in public. Money is to buy goods and services in a free exchange. When government agents acting in their official capacity accept money or the promise thereof in exchange for official action, this is called corruption. All human systems are corrupt, and no solution to corruption is perfect, but ours is pretty good compared to others.
> The idea of a constitution and separation of powers is to constrain the types of government that can legitimately exist.
It's ironic to read this in the context of what's been happening in the US recently. When the trillionaires and grifters (but I repeat myself) have fully captured the US government, you'll be able to complain that that government is no longer "legitimate", but that's not much consolation.
> just buy the government they want
The idea of a constitution and separation of powers is to constrain the types of government that can legitimately exist. This does work to some degree. No matter how wealthy you are, you can't kill people in public. Money is to buy goods and services in a free exchange. When government agents acting in their official capacity accept money or the promise thereof in exchange for official action, this is called corruption. All human systems are corrupt, and no solution to corruption is perfect, but ours is pretty good compared to others.