"Sadly, now both boys are denied their fathers over actions following what could be called an insignificant game."
It is a rather muddy sentence, isn't it? In the actual case, ice hockey dad Thomas Junta attacked and killed the father of another young player. So that player no longer has the pleasure of having his father watch him play, while Junta Junior suffers the same fate because presumably his father is in jail. The significance or lack thereof of the game hardly seems relevant to me, much less important.
Leaving aside the specifics of the case, in order to make the sentence active you would have to postulate an actor, say for example anonymous ice hockey officials. E.g.:
Officials concerned about extreme violence among spectators have banned both fathers from future games, thus denying both boys the pleasure of having their fathers see them play.
Student or Learner