Answer: Variety of measures and treatment available to judge for criminal conduct.
Explanation: for one offence there is a range of punishment eg: it may go like fine of 2,000 or 6 months jail. so now, it's in the hand of judge to opt for what punishment he/she want to give to criminal in that bracket.
The rationale behind this is that there are different circumstances for one person to do one crime. eg one violating traffic norm for providing pass to ambulance will be different from doing rash driving.
should it be kept with judge only?
The answer is that judge is the most suitable person to decide in the whole system no one else can replace or do similar job.