You are ignoring the big picture outcome of the resultant culture that develops in a society in which criminals can easily flee and not be chased. Culture shifts for the worse in an environment that is less likely to catch, arrest, or prosecute criminals. Trust and norms erode.
The factual outcomes almost don't matter; what matters is perception among the masses. For example, if people largely believe that shoplifting is not prosecuted in a city, and they see shoplifting occur, it is extremely depressing, even if they see the person arrested. It's demoralizing. It also probably leads to more attempts at shoplifting overall. I use this example because it's common enough in a few cities.
High speed chases are rare, so it's not as immediately obvious. But if people see on the news two stories, "man kills woman, cops are there, he flees in car, high speed chase, crashes into innocent bystander killing self and them" versus "man kills woman, cops are there, he flees in car, police arent allowed to chase him so he is currently at large, but they are trying to track him by other means", the latter is far more demoralizing, makes one lose faith in society and the rule of law, makes one less proud of their culture, etc etc. This is a serious effect over time.
At some level, society needs to believe that bad behaviors are punished and that good guys are trying their best to stop bad guys. This is very important to a functioning society. When people stop believing that, culture declines rapidly. Even if the utilitarian outcome is slightly better when not stopping bad guys sometimes (e.g. not prosecuting the previous president even if you could), it's usually not worth the resultant demoralization.