Sweden hasn't been as affected as other countries. Instability will always spill over from conflicts, there's nothing special about this era. RAF occupied the West German embassy in Stockholm in 1975 and planned to kidnap a Swedish politician. To some extent it's the same for France, they didn't invade Iraq, created Guantanamo or other things to escalate the conflict yet they are targeted. Maybe because they have a lot of dealings in the Middle East or to please IS supporters or it's just convenient. I'm sure people will speculate a lot about this in the coming months.