In court you sometimes suspect this

Crystal BALLS.

Human Error.

Human ego.

Power corrupts and absolute power corrupts absolutely.

Justice will never occur on Earth among humans.

Judges don't know their place and have highly inflated ideas of their importance.

Blackstone:

"For, whenever a question arises between the society at large and any magistrate vested with powers originally delegated by that society, it must be decided by the voice of the society itself: there is not upon earth any other tribunal to resort to."

Sir William Blackstone, Blackstone's Commentaries on the Laws of England, Book I, Chp3, pg.205/6

Judges need to recognize that they have absolutely no authority that does not come from the people and no authority to overrider the people.