What is the proper role of government?
Or we can ask what is proper role of power, for the government exercises power.
And we know that power tends to corrupt, and absolute power corrupts absolutely. So we limit power. We don't abolish it. We limit it by liberal democracy.
Unfortunately the USA is a bourgeois democracy rather than a liberal democracy, in that the USA does not have a Government and an Opposition, rather the USA has two parties of business.