I don't doubt the police will sort them out. They just have a knack of causing a fair amount of destruction beforehand.
Not really, all sensible areas are in the hands of the police. It takes max. 5 minutes until the first dozens of rioters are arrested. That happened several times in various cities, there has never been much damage. The security concept is working well. It could be a problem if Germany loses - because the fans outnumber the policemen - but it ain´t happen /joking.