At some point Mike Tomlin needs to be held accountable for his own behavior and the behavior of his coaches, all said and done. The fact that Porter was given the game ball after the game is a disgrace. So is the fact that multiple coaches on his staff (HC included) have now been involved in on-field incidents—that's totally unprecedented.
Coaches should be held to a higher standard and both Munchak and Porter should be suspended, and Tomlin put on notice. Marvin can't keep his players under control which sucks for him, but Tomlin has a pattern of actively encouraging this type of behavior which is definitely worse.