The crime is against community.  The community is due an apology. 

When a man beats his wife, it is a crime against society.  Even if she forgives him and does not prosecute her civil claim, society still goes for a criminal conviction. 

That fat asshole didn't just screw Mr. Murck, he screws everyone.  Everyone who doesn't demand an apology accepts such behavior and further harms the community.  He should be held to account.  That is all.