When varying the statutory ratio between head sentence and non-parole period on the basis of special circumstances, sentencing courts must consider not only the offender's subjective circumstances and prospects of rehabilitation, but also the objective seriousness of the offence and the need for general deterrence, to ensure the minimum period of imprisonment properly reflects the nature and gravity of the offence. Speculative future placement in protective custody, without evidence, cannot ground a finding that custody will be more onerous. A discount of 20% for a guilty plea on arraignment, while generous, is within the range of the sentencing discretion.
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