Because he was right. Jimmy was sabotaging him. But see, the two brothers act on different codes.
Chuck’s is a legal code. He doesn’t waver, even a little bit, outside the law. Nothing Chuck has ever done has been illegal at all. Not hiring Jimmy, legal. Blocking Jimmy getting hired at all, legal. Actively exposing Jimmys ways in board meetings, legal. Trying to prevent expensive clients from leaving his firm, Legal.
But none of it is Moral.
Jimmys Code is a moral code. He looks after his friends, illegally. He signs on clients he KNOWS are illegally being kept from him, which is illegal. He scams douchebags out of thier money at bars, illegal (maybe?). He uses fraud to make his Brother look bad in court, illegal. He pays off witnesses, illegal. He falsifies evidence, illegal.
But, to him its all for the right reasons, aka Moral.
Jimmy is about results, Chuck is about methods.
And literally every single doubt that Chuck had ever expressed about Jimmy has been substantiated ten times over.
And I’m more convinced than ever that the whole “Allergic to electricity thing” is completely brought on by Jimmys shenanigans. Him trying to look over his brother is causing him mental anguish. When he thinks he has Jimmys number, the electricity is not bothering him. As he realized hes falled into another trap by Jimmy, his condition magnifies until he keels over and hits his head. Clearly, Jimmy is the source of his condition.
Chuck should have let Jimmy rot in that jail cell, and gone on with his life. The only time I’ve seen him make a Moral choice over a purely legal one, and it ruined his life. I feel bad for the guy. He’s not done anything wrong. He’s like the Skylar of BB season 2-3, where its all hate just because hes the antagonist, no matter how right they are.