What's so different between Minneapolis and Wisconsin that hordes of Wisconsinites would come to town to do things that Minneapolans would never do? That seems implausible, at least to a know-nothing outsider like me.
For sure, but why would the Wisconsinites be behaving any differently in terms of violence, looting, etc.? I suppose it could be selection bias. Maybe it takes a higher level of anger to drive a couple hours than to go someplace local, and that's more correlated with violent behavior.