I think it might help if fans realize that it was a one time incident that shouldn't happen again. The parties involved have apologized, and that is in the past and that is where it should stay.
Like it has been said before, there were no problems in the previous games, so there should be none this time.
Both teams are well coached and know discipline. Now if some of the fans were to get some discipline, I think the problem would be solved.
I guess it can all be boiled down to one statement... "Don't be stupid"