1.   The cops, having decided right away that the parents were guilty, ignored and squandered evidence that might have nailed the killer.

2.   Failure to nail a killer has spawned a cottage industry in conspiracy theories that blames everybody from Kurdish militants to right-wing Swedish police officers.

3.   Failure to nail a killer has spawned a cottage industry in conspiracy theories blaming everybody from Kurdish militants to conservative Swedish police officers.

4.   Failure to nail a killer has spawned a cottage industry in conspiracy theories that blame everybody from Kurdish militants to right-wing Swedish police officers.