From the New York Times:
Are Immigrants Causing a Swedish Crime Wave?
TAKING NOTE MARCH 2, 2017
… To better understand that country’s experience, I spoke to Henrik Emilsson, an international immigration researcher at Malmö University. …
Is there any evidence that recent immigrants are having an impact on crime in Sweden?
Not the recent ones. There is a huge debate in Sweden about immigration and crime. And we know from earlier statistics that the foreign-born commit three times as many crimes on average as native-borns. But these riots and crimes in the suburbs, they are related mostly to drugs and gangs. Those people are born and raised in Sweden. It has nothing to do with the recent immigration. It’s the children of migrants and maybe people that came when they were young.
There has been this issue of sexual harassment. And there is some evidence that the new refugees are somewhat involved in this. But there are no official statistics on it.
What about terrorism?
Not particularly, because the people for example who have gone and fought for ISIS, they are also quite established — they are Swedes that have grown up here.
S0, stop worrying about what immigrants will do over the next 5 or 10 years. Worry instead about what their descendants will do over the next 50 or 100 years. Don’t you feel better already?