Damned if I can understand the reason why

I am listening to the mighty DAMNED this morning while reading Canadian press reports of last night's riot in MONTRÉAL.
Groups of rioting fans set fire to police cars, smashed store windows and looted local businesses after LES CANADIENS DE MONTRÉAL defeated the Boston Bruins, 5-0, in Game 7 of their Stanley Cup playoff series.
Les Canadiens have not really won anything yet -- the team remain 12 victories away from winning the Stanley Cup. Still, last night's victory celebrations in the streets turned ugly, with police arresting 16 people who face a number of charges -- including breaking and entering a business, armed assault on a police officer, mischief on a police vehicle, assault and various bylaw infractions.
It doesn't make much sense to me.