One of the things that scares me about the US criminal justice system is that it relies almost entirely on magical thinking and torture to secure convictions. I don't believe anyone is guilty unless they were literally photographed holding the bloody knife while standing over the body and even then I'll need some convincing to rule out potential mitigating circumstances.
Murder mystery as a genre did a massive damage to the society by convincing people that the police is good at solving murders. I believe that a large number of people are actually skeptical or cynical about the performance of the police, but they kept thinking about the murders and serial killers and thought "Without the police, who would solve all the murders?".
Except of course, in reality the police actually fucking sucks at solving murders and mysteries.