You don't acknowledge our history, in which state prerogatives were generally well protected by the states prior to the 17th amendment.
The government in DC is not federal and has not been federal since 1913. It is consolidated. There is a ruling class up there with an R or D after their names that makes absolutely no difference.
The framers knew the fallen nature of man and designed a system to minimize the influence of the bad side of our nature. They did it by dividing power, by retaining the federal nature of the Articles of Confederation, in the Senate of the States under the constitution.