Abuse of the lax laws of immigration. In America the same thing we have with illegal immigrants (of all nationalities). Doesn't make sense to be angry at the host country because you don't have a job. those people willingly moved there, and must adapt to the country's culture, language, and laws. If it were a Muslim country country, and a lot of Swedes moved there they would have to adapt.
Hee in the US, many illegal immigrants protested last summer for "immigrant rights", yeah, they left off the illegal part. Many want to change things here, but didn't try to change their mother counties policies.