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I think part of it is a fundamental weakness in the Swedish judicial system where you need clear perpetrators and clear victims, meaning that if you have a group of people committing a crime and you can’t prove that they intentionally cooperated to commit the criminal act or who did exactly what, they may go free (exhibit A). The same goes if you can prove the crime but not the victims (exhibit B).
Of course the bar is higher when it comes to the police, they will pull out all the stops to prevent one of their own getting investigated, but this issue runs even deeper.
I think the idea is that the play order for the entire playlist is shuffled on each loop, so you play all songs in one order, then it shuffles, and you play all songs again but in a different order.