Considering the warrant is out for a foreign national, i.e. not a Swedish citizen of whatever origin, I would say the jury is still out on whether multiculturalism works as a policy, or not.
Sweden, if it's supposed to be practising multiculturalism, simply hasn't had time and opportunity to get to work on this sad feck's case yet. If he's even still in the country, it might get the opportunity to do so, in prison.
Apart from that the OP might be allowed to wonder wheter nations shouldn't simply close their borders, for fear of nasty furrinners making a beeline for them? That might prove impractical however...