serial killers have always been a very rare phenomenon, certainly not prominent enough to justify the extent of policing seen today in most developed countries
catching serial killers is detective work that only involves a small subset of the police force, meaning that the aforementioned policing is not merely undue, but actually useless
the violent criminals who are not serial killers reoffend upwards of 50% of the time, sometimes higher in certain countries
All of the evidence points to the conclusion that the police system, in the overwhelming majority of cases, creates a false sense of justice in which people harm others, get punished with a few years of slave labor for doing so, and the structural reasons that led them to harm others to start with remain unaddressed, leading them to resume the same type of harm but with tactical adjustments made to avoid getting caught again learned through prison socialization.
Except:
All of the evidence points to the conclusion that the police system, in the overwhelming majority of cases, creates a false sense of justice in which people harm others, get punished with a few years of slave labor for doing so, and the structural reasons that led them to harm others to start with remain unaddressed, leading them to resume the same type of harm but with tactical adjustments made to avoid getting caught again learned through prison socialization.