If the courts do not dispense fair justice, they abrogate their very purpose, which is to prevent blood feuds and revenge killings.
In many times in the US, such legal failure could have resulted in homicide, which failed only because the aggrieved party tried to subcontract their revenge.
Were they instead, to just bide their time, and carry out their revenge personally, it is likely it could have succeeded. Yet such stories seldom make the news, for the obvious reason that they were successful.
There was even a movie made about that: The Crossing Guard with Jack Nicholsen. The guy should have gotten 20 years at least, what a sham. How can a Judge do something like that and live with himself?