The probation service is primarily an enforcement agency. From their website:
"The Probation Service is an agency within the Department of Justice and Law Reform. We play an important role in helping to reduce the level of crime and to increase public safety by working with offenders to help change their behaviour and make good the harm done by crime. We are the lead agency in the assessment and management of offenders in our community."
If they happen to help offenders along the way, all well and good, but it is not their prime function.