A psychiatric disorder remains relevant to sentencing even where it did not directly cause the offending, warranting consideration of reduced weight for general deterrence and the more onerous nature of incarceration for the mentally ill. The R v Henry guideline for armed robbery (4-5 years for a young offender with little or no criminal record) should not be strained to cover offenders of a different category. Fresh psychiatric evidence on appeal may justify altering the apportionment between non-parole period and additional term even where the total sentence is maintained.
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