When sentencing an offender whose mental illness is causally connected to the commission of the offence, the mental illness must be considered as part of the objective seriousness of the offence (not merely as a subjective mitigating factor). A finding that an offender's failure to take psychiatric medication was the offender's own fault must be proved beyond reasonable doubt and requires examination of all circumstances surrounding the failure. The Hemsley principles regarding the effect of mental illness on moral culpability, deterrence, and the weight of custody apply to the total sentence, not merely to the non-parole period.
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