We're not talking Benedict Arnold here.
This is a nearly 300 lb fullback, hyped up on pre-game adrenalin, his mind far from thoughts of patriotic etiquette, and not knowing what the hell to do with a flag.
This sounds like a Florio-esque witch hunt to me.
Edit to say: After reading the piece, and seeing where this was written in, it's not a real indictment at all. In fact, Sellars probably deserves the rib shot in the game-notes for being such a knuckle-head..