If I were the coach....
To me this would be a hard decision to make. The football team, the school, and the community would be affected by this decision if you choose to take Robbie out (and most likely lose the game) or if you keep Robbie in (and most likely win the game). Because as a football coach or any leader in general I would try to be a good example to kids and not support bad behavior, if Robbie's actions go against my philosophy as a coach and my team rules, I would take him out of the game. Though this choice might come with an outcome of losing the game, this experience should teach the football players that I won't reward bad behavior.