I don't know where, when or why rioting became a form of celebration, but this is ridiculous.
I am guessing that you and I are much the same...when feeling deliriously happy we may do any number of things to celebrate.
We raise a glass!
We do a little victory dance, and maybe a wiggle!
We hug and kiss our friends, and perhaps a few strangers!
We "Neener Neener," the fans from the other side.
I have been a part of a few celebrations, some of them sports victory celebrations, and unless my memory fails me, I can't recall ever doing anything destructive. You have probably also never set a fire or rolled a car onto it's side in celebration of a win. At least, that's my guess.
Fans in Philly are not the first to get out of control in celebration of a win.
And the fans in Philly didn't completely melt-down.