The real meaning of sirens is to stop crime. If the siren will arrive at the scene of the crime a minute earlier than the police car, then this minute is likely to allow the victim to survive. Generally speaking, bandits may not commit crimes just one minute before the arrival of the police car, but if the siren can play the role of warning, deterring and alerting the bandits, so as to save the victims' lives with a very small probability, then the siren is worth sounding. After all, the criminal has escaped and can be arrested again. If life is lost, it cannot be saved. This is the greatest respect for life.
