I don't actually believe that, because the Constitution is deliberately vague about what the government can and can't do. It exists in its current form as the result of 250 years of evolution, following the rules at each step as best it could.

Even so, I'd be willing to say, "Sure, fine, the government is doing more than it should". That's pretty vacuously true, and also irrelevant. Getting people to agree on which parts are important, and finding a better way to implement them, seems a more germane question.