The parity principle applies with caution when comparing sentences imposed on an adult offender with those imposed on juvenile co-offenders in the Children's Court. Where the Children's Court sentences are demonstrably erroneous and do not reflect the criminality of the offence, the adult offender may have a justifiable sense of grievance warranting appellate intervention, but any re-sentence must still reflect the objective and subjective criminality involved. An offender's borderline intellectual disability and poor psychosocial functioning are significant subjective features that may render a sentence at the high end of the range manifestly excessive.
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