I think Spooner got it right:

If the jury have no right to judge of the justice of a law of the government, they plainly can do nothing to protect the people against the oppressions of the government; for there are no oppressions which the government may not authorize by law.

-Lysander Spooner from "An Essay on the Trial by Jury"

There is legitimate law, but not once law is licensed, and the system has been recursively destroyed by sociopaths, as our current system of law has been. At such a point in time, perverse incentives and the punishment of virtue attracts sociopaths to the study and practice of law, and drives out all moral and decent empaths from its practice. If not driven out, it renders them ineffective defenders of the good, while enabling the prosecutors who hold the power of "voir dire" jury-stacking to be effective promoters of the bad.

The empathy-favoring nature of unanimous, proper (randomly-selected) juries trends toward punishment only in cases where 99.9% of society nearly-unanimously agree on the punishment, making punishment rare. ...As it should be in enlightened civilizations.

Distrust those in whom the desire to punish is strong

 — Johann Wolfgang von Goethe