Why do people smash things when their sports team wins?

Can someone please explain to me what burning cars and e-bikes and smashing and looting stores has to do with celebrating a sports victory?

After Paris St-Germain beat Arsenal in soccer's Champions League final this weekend, PSG fans went on a rampage in Paris and clashed with police, 219 fans were injured, eight of them seriously. Bus, train and rail services were severely disrupted, and one person was reported dead after an accident on the Paris ring road.(which may or may not have been connected). Some 6,000 police officers were mobilized this year after similar celebrations turned violent last year, and 57 of those police officers were injured. In all, 780 people were arrested, with over 450 of them still in custody. 

So, this then is what the French do when their team wins? What is the psychology behind that? Or is it just a function of the amount of alcohol imbibed? I could almost understand it if they had lost and they were frustrated, although it still wouldn't be justified.

Well, it turns out that psychology and sociology do have something to say about these violent revellers. 

For one thing, there is something called the "group contagion effect", whereby the anonymity of being part of a large group makes people feel they can get away with something illegal or dangerous, and generally let loose their aggresssive side. After a particularly intense game, people may search for a release from the tension through destructive behaviour. This can quickly spiral out of control in a large crowd of other like-minded people, and soon the usual rules and norms get overridden.

There's also an aspect of crowd behaviour called "excitation transfer", where extreme happiness can turn into extreme aggression as one part of the brain gets over-stimulated and over-excited. A state of high physical excitation (increased heart rate, adrenaline production, etc) can continue even after the initial arousal, and the body's leftover energy can become misattributed or transfered to a different emotional stimulus.

Well, maybe there are perfectly good psychological explanations for this stuff, but it still doesn't make any sense to me!