Any person who can kill civilians like this is merciless and evil and should be put down with utmost force. These people bring a bad name to Islam. Also what is the logic of attacking countries that have never done anything against any muslim whatsoever? I mean Sweden? Really?
This is where you're going wrong.
Stop trying to look for logic in an act that is without logic. To do so...justifies the killing of innocent civilians elsewhere.
Did 9/11 victims logically 'deserve it' because of US foreign policy? That's a slippery slope none of us should go down.