I agree with your last statement. But why hold a nation/state accountable for the actions of a handful of stupid people, eh?
Monitoring? No, they require policing. If they want to conduct themselves in ways that as you say translate to behaving worse than wild animals, or as I say, simply behaving violently uncivilly, then they can be expected to pay the price for such behavior. I don't see why the 99+% of the civil behaving world that cannot justify setting vehicles on fire, breaking store front windows, looting, etc. and whatever it may have been, simply as a result of their team winning the pennant.
Heck, if everyone around the country at home alone behaved like that every time our team won we'd be justified running over to our neighbors' houses, setting their cars on fire, throwing things through their windows, etc.
Common sense, decency, civilty, being able to celebrate without committing criminal activities should not be a difficult thing to do.
In fact, I'll say this; that if my team EVER won and I found myself outside the bar where I just watched the event in the city where it occurred, and I saw people rioting and setting vehicles on fire, I'd put some distance between me and them simply for fear that they may be about to draw the wrath of the enforcing authorities.
I think it speaks volumes, negatively, about any group of people that cannot celebrate without damaging their environs in any way. Get drunk, scream, wave your arms, but frankly, if you really need to set a car on fire, then you need some serous counseling! Sorry to say...
This situation is tragic as I've said. But it shouldn't, although it will, hamstring the ability of the authorities to enforce and police such behavior. Best case: She was in the wrong place at the wrong time. Worst case: She was one of the participants which it does not appear she was. It's a downright shame. But if she had applied some common sense and gotten away from such a group, then it never would have happened!