Immigration is a tricky thing. You need to get them civically integrated.
Sweden, allows just about anything. They are also the second rape capitol of the world, after a village in south africa.
Integration, is so important. I recall a hilarious thing happening last year at a bachelors "RMP" (religion, meaning, philisophy) class. The classgroup consisted of third year students in professional bachelor chemistry and medical chemistry, so its usually around 50% girls.
In the class, was a Moroccan Berber, the least well integrated community in Belgium (sadly). Somewhere they touched a topic about "cheating". He took the word and said that cheating way okay for a male cause a women can deceive them, but any women that cheats should be stoned. In a class with 50% western girls (who are quite vocal).
Yeah, that apparently was fun