Actually, this isn't as relevant as it seems. The parole judges in the study are given a steady stream of cases, without deliberation. There's also a clear default: "no"

Some court decisions fit that mold, but many do not. Often, court decisions have no default, and the judge retires to consider the arguments.

The study in question was very important for showing that humans are often not guided by rationality. But it's not necessarily a great demonstration of how all legal decisions are made.