It's wrong to try to get revenge
Morgan is told by a witness that it was Jim who attacked his wife last week.
Morgan wants to act on the new information about Jim.
Morgan looks up Jim's address and calls the police to report where he lives.
Morgan looks up Jim's address and finds him and then proceeds to beat him up as payback.
The police arrest Jim and Morgan gets the closure he needs from the incident.
Morgan is found by the police and arrested himself for assaulting Jim.