Farsical. Just because the investigators don't have the actual perpetrator(s) on the radar it doesn't follow that the only one they haven't managed to look more

Farsical. Just because the investigators don't have the actual perpetrator(s) on the radar it doesn't follow that the only one they haven't managed to look more closely at is the perpetrator. They still need some actual evidence. Being angry because Stig is more intelligent than the police, and told them so, is not evidence.