Undocumented immigrants in the US who don't want to be discovered and deported are different from documented "refugees" (or actual refugees) in Europe. The latter don't have anywhere near the same reason to fear being deported or banished -- and they can be quite criminal with very few consequences (depending on the country they are in -- one of the reasons why Sweden is so popular at the moment).

Unless I'm missing something, there's no actual data about per capita crime or criminality rates by country of origin or even immigration status in that article. That's the data that would actually be useful.