Meh, they're just copycats. Montreal started it way back in 1955:
http://en.wikipedia.org/wiki/Richard_Riot
"a
riot ensued outside the Forum. Rioters were heard chanting "À bas Campbell" (Down with Campbell) and "Vive Richard" while they smashed windows, attacked bystanders, set fires to
newsstands, and overturned cars. Over 50 stores were looted and vandalized within a 15-block radius of the Forum. Twelve policemen and twenty-five civilians were injured.The riot continued well into the night, eventually ending at 3 a.m., and it left Montreal's
Saint Catherine Street in shambles. Police estimated between 41 and 100 individuals were arrested. Damage was estimated to be $100,000 ($822,695 in 2011 dollars) to the neighborhood and the Forum itself. One jewelry store alone estimated its losses at $7,000 ($57,589 in 2011 dollars).
Then in 2008,
police cars burned, stores looted in Montreal hockey riot.
And 2010:
what began as an eardrum-rattling eruption of hockey joy ended in an eye-burning cloud of tear gas as looters and police squared off on streets that had just celebrated a memorable Montreal Canadiens win.