What the Op implies, is that they are not happy in their countries,but when they find freedom, health care, voting rights etc...in other countries,they demand that the people who host them, create the same life style with benefits for them like halal food for example.
What's more important halal food or freedom?
Jewish people found away to eat kosher and shut up, why don't some muslims do the same?
It is written in the Coran, that you can pray at home if you want, no need of a Mosque.
Why do they have to build more mosques?
how do the Europeans and Americans feel about this?