Ben Franklin's often quoted phrase “You have a republic if you can keep it.” was a portent of this future. The Constitution itself set up a the adversarial relationship between and a central government on one hand and state sovereignty and individual freedoms on the other. The further removal of state protection by changing the process of selecting US Senators whom, once elected, had no physical or practical ties to the well being of their individual state accelerated the the demise of state sovereignty.
We are living witnesses to the completion of a national government and the demise of any semblance of a republic.
What Roberts is saying is: if you can conjure up a 51.1% majority, you can screw over the 49.9% left any way you please and I won't interfere.