Selective probation/supervision is necessary for fairness in Justice. Sentencing guidelines will never be perfect. If one attacks a teenager with a knife and causes serious injury the attacker gets one year prison time, where as touching the private parts even without force one can get 14 years of prison time.
With public emotion coming out of culture, religion and past grievances over injustice punishment guidelines for sex offense is too high. I think a rehabilitative probation system is a better for everyone than mandatory long sentencing.