What’s the point of prosecuting crime? What’s the point of putting people in prison?
Surely, in any well-functioning society – let alone any well-functioning democracy – there are a number of good reasons for prosecuting crime. There are also some that are not as obviously good.
Prosecuting crime prevents the people who commit crimes from being in a position to commit further crimes. Specific deterrence – deterring the specific person – makes sense as a function of sentencing.