Discretion isn't just about the subject but also about greater society and even the one investigating. Sometimes a fleeing traffic violator are let go not beca

Discretion isn't just about the subject but also about greater society and even the one investigating. Sometimes a fleeing traffic violator are let go not because they individually are somehow worthy but so that a chase doesn't result in greater risk to innocents. Sometimes a cop walks away from a riot because he'll get his ass beat if he tries to seek justice. Sometimes a brutal dictator is allowed to walk away into exile in the interest of greater peace of society. It's not as simple as you say "on the basis of the person."