Shit happens. There are bad people in this world. They did lock up Peter Mangs, a Swedish gunman, so that's good.
It is just dumb statement after dumb statement with you. Your response to serious crime like murder being brought in by immigrants who shouldn't be there to begin with is "shit happens". You have zero credibility and have exposed yourself as not a serious person I am sorry to tell you.
The response is to stop the immigration from those countries bringing in murderers, rapists, and other criminals. Sweden does not need mass immigration and it is so clearly a net negative in many ways. That is the solution.