RWarehall: Also of concern should be questions of whether a given country can meaningfully absorb refugees. Are jobs there? How many? Is there any existing cultural "anchor", other Arab minorities who can help the refugees adapt? There are cultural challenges if one cannot speak the language. I get the feeling the refugees were let in without real answers to many of these questions.
To quickly answer from a Belgian perspective (don't have the time to dig through my bookmarks)
Are jobs there? How many? ==>> I'll take the case of Brussels has it's the city with the most immigration.
Unemployment rate in August 2016: 17,8%
http://www.7sur7.be/7s7/fr/3007/Bruxelles/article/detail/2850902/2016/09/05/Le-taux-de-chomage-en-baisse-d-un-point-a-Bruxelles.dhtml But like how our job system is, new refugees would be on the job market at the same level (odds to get a job) that the "NEET" demographic ("Young people neither in employment nor in education and training" according to Eurostat). The NEET percentage in Brussels is 24%
http://www.rtbf.be/info/societe/detail_17-5-des-belges-de-20-a-24-ans-sans-emploi-et-sans-formation-en-2015?id=9489091 Also, I couldn't retrieve the article (although it got well shared when it came out 2-3 months ago) but many societies have left Brussels (to settle in Brabant) and there aren't enough new companies created to replace them (it's worth noting at this point that there aren't many Brussels citizens going out of the city for their job).
Is there any existing cultural "anchor", other Arab minorities who can help the refugees adapt? There are cultural challenges if one cannot speak the language. There you go on the main difference between the US/UK point of view and the rest of Europe mindset as US/UK has a communautarist approach.
As a rule of thumb, new immigrants in a country will tend to go where there are "pools" of jobs (not necessarly meaning they will get it as pointed above). In this article, you have a Belgian map of the recent refugees who left out the towns they were assigned to in order to reach those "pools" (Brussels, Antwerp, etc.):
http://www.sudinfo.be/1709545/article/2016-11-03/de-plus-en-plus-de-refugies-quittent-la-wallonie-pour-rejoindre-la-flandre Once in Brussels or Antwerp, they're very likely to settle in Borgerhout, Schaerbeek, Molenbeek, etc. as their communities are already there because it's in human nature to get acquainted with the people you're closer to. That's how ethnic communities grow up exponentially in big cities.
The question of the language is interesting as to take an extreme example, I knew a Turkish guy who lived in Netherlands for many years but couldn't speak Dutch better than me (it's not my primary language) because he lived among his community and after moving in Brussels, he couldn't speak in French neither. Thus that led to situations where he couldn't even speak with the local Arabs (as they don't speak Turkish). Not every foreigners's case is like that (and I've met many) of course but that shows how being "overly integrated" in your community can prevent you from participating and being included in your host country.
As hinted by your post, Molenbeek should be the "community host" of refugees and well, the failure of that district on every level (social/economics/culture) speaks for itself.
Interestingly, there has been recently a recent official report in UK about the communities model which fueled some debates in the medias. I haven't read it as a whole (199 pages) but you might find some answers from your US/UK point of view:
https://www.gov.uk/government/publications/the-casey-review-a-review-into-opportunity-and-integration PS: Fuck, got carried away and spent too much time writing this post, I should leave this thread for a while :D