The relevance of the offender's mental health impairment to the sentence
- The courts have had long experience with, and have developed principles applicable to, persons with mental health conditions who commit crimes.
- In the present case, the offender did not submit that, if the diagnosis of Dr O'Dea were to be accepted, the offender's condition was so connected with the commission of the offences as to impact their objective gravity. He did, however, submit that the offender's bipolar disorder operated so as to impact his moral culpability. [41] It is clear based on the jury's verdicts that the offender knew his act was wrong in the relevant sense, that being that he could reason with at least a moderate degree of composure. Further, in relation to the offence of murder any impairment in control or otherwise was not of a nature such that it warranted a finding of manslaughter. In the context of what I have found to be the presence of a bipolar disorder, the evidence of the offender's vacillation in relation to the offence of murder, does suggest some attempt to resist the urge to kill. I am of the view that the offender's condition materially impacted on his decision to kill Mr Murray with some consequential impact on what might be described as his moral culpability. Subsequent to the murder, the offender's grandiosity when dealing with police supports that conclusion. That impact is to my mind also demonstrated by the absence of evidence the offender has acted on violent urges following his being treated for bipolar disorder.
- In relation to the attempted murder of Mr Mellows, there is no evidence of the same vacillation. Rather the offender acted on a plan which he deferred for reasons so banal, the plan and those reasons suggest a complete disregard for human life. The evidence is, however, consistent with the offender's grandiose view of himself and his plans, which I find were related to a manic episode. There is again some impact on the offender's moral culpability.
- To better understand the view I have formed, it is helpful to note the offender's presentation to emergency in 2012 seeking help to address his violent impulses. His attempt to obtain help suggested the urges were "ego-dystonic", that is, inconsistent with the offender's view of himself. [42] The offender's view of himself, particularly as demonstrated in the interviews after the murder, the attempted murder and the attack on the prison officer, suggested the offender's view of himself changed, or his ability to control himself changed, or some combination of the two.
- In my view the offender's mental health materially contributed to the commission of both offences. The need for denunciation is, consequently, reduced. The weight to be given to general deterrence is also reduced, but by no means eliminated, on the basis that the offender's condition makes him an inappropriate vehicle for providing an example to others. While a mental illness can, in some cases, increase the onerousness of imprisonment, there is no evidence in the present case that the offender's sentence will bear more heavily on him because of his mental condition.
- I have considered whether specific deterrence should have an increased role. The offences were committed in the context of what I have found to have been an undiagnosed bipolar disorder. The offender is now being treated for that disorder. While there is some way to go, the evidence of the offender's response to treatment is such that I would not increase the weight to be given to specific deterrence based on his mental condition. In coming to this view it remains the case that both specific deterrence and the protection of the community have an important role to play in any sentence to be imposed.