Because a law is a machine to compact thousands of hours of ethical thought into an actionable doctrine. It's designed specifically to take the subjectivity and

Because a law is a machine to compact thousands of hours of ethical thought into an actionable doctrine. It's designed specifically to take the subjectivity and bias out of executing policy, which is introduced by a single (or small group of) human brain(s) working on a problem for a few weeks, at most. Courts are a last-ditch effort to jury-rig a conclusive plan of action to rectify whatever dilemma come before them; as with similar tasks, they're more expensive and time-consuming at-scale than just planning correctly at the outset.