Yes, in a rule-of-law state a fair trial with a just outcome is mandatory. You can’t just go around and kill people. If he lost a loved one to unfair practices of the insurance, that needs to be taken into account during trial.

The best example for a justice system working is a case we had in Germany in the 70s. A child rapist and murderer was shot in court by the mother during trial. She was then prosecuted but didn’t have to go to jail due to the circumstances of the case. Her being tried and prosecuted means the case was closed without any loophole having to be used.