Since the New Deal, courts have permitted almost any legislative infringement of economic liberty that can be said to have a rational basis. Applying this extremely permissive test, courts usually approve any purpose that a legislature asserts. Courts even concoct purposes that legislatures neglect to articulate. This fulfills the Roberts Doctrine that it is a judicial function to construe laws in ways that make them perform better, meaning more efficiently, than they would as written by Congress.

Thursday’s decision demonstrates how easily, indeed inevitably, judicial deference becomes judicial dereliction, with anticonstitutional consequences. We are, says William R. Maurer of the Institute for Justice, becoming “a country in which all the branches of government work in tandem to achieve policy outcomes, instead of checking one another to protect individual rights. Besides violating the separation of powers, this approach raises serious issues about whether litigants before the courts are receiving the process that is due to them under the Constitution.”

The Roberts Doctrine facilitates what has been for a century progressivism’s central objective, the overthrow of the Constitution’s architecture. The separation of powers impedes progressivism by preventing government from wielding uninhibited power. Such power would result if its branches behaved as partners in harness rather than as wary, balancing rivals maintaining constitutional equipoise.