It's not an issue of "controlling the game". The game was never out of control. You lose control of a game when teams are sparring. The other team did not retaliate.
Those fucktard (can't believed I used that expression) refs are either complicit or incompetent and neither is acceptable. There's just no way under any reasonable judgment and experience that foul 5 is not a flagrant and, if you to consider his previous fouls, an ejection.
Those kids didn't look very skilled so it COULD have been a JV game but that is still no excuse.
I don't know about getting involved as a parent but I'd be pretty fucking vocal. And I'd fully expect my son to retaliate - he'd face no discipline from me.