The following editorial from The New York Times points to a key reason why the presidential form of government delivers a responsive justice system: states manage their own judiciary. States have legislatures, they make laws, and they adjudicate them in their own courts. Federal laws, made by the central government, are dealt with in federal courts. Inter-state and foreign legal matters come under the jurisdiction of the federal judiciary. This system has all the benefits of decentralization. 

There are two other factors that make the American system of justice one of the best in the world. First, the Constitution is held supreme, instead of the legislature. America’s founders rejected the British notion of parliamentary supremacy.  Second, elected representatives of both executive and legislative branches have a say in the appointment of judges. No one has carte blanche. 

Here’s the NYT piece showing some benefits of this decentralized system of justice…

Link to the NYT