The penalty for fighting is 5 minutes. Fighting on ice has inherent risks, including whacking your head on the ice if you lose. If you do not want to run those risks, do not start a fight in an NHL game.
Wilson attacked someone who never consented to a fight. That's an play that absolutely should be suspended. Chatfield agreed to a fight instigated by the other guy and won it. That should never in a million years be suspendable. I experience zero cognitive dissonance with that. If you agree to mutual combat, which, by the way, is *already* against the rules, just not that heavily penalized, you accept the risk. It's not the job of DOPS to police the unwritten rules, only the written ones. By the rulebook, Chatfield is guilty of getting into a hockey fight, nothing more. The NHL rulebook says the penalty for that is a 5 minute major penalty, which was properly assessed.