His Honour then explicitly disclaimed any influence on his sentence of the applicant's depression.
35 I am not quite clear what his Honour meant by the first passage set out above. He appears to have had a view that, if the applicant had been depressed to the point where he could not form a view that he wanted Ms Benitez and Mr Hoiberg killed, this would be relevant to sentencing. Of course, if that were the case, the applicant could not have been found guilty of the offences, and his pleas would have had to be rejected.
36 As to the second passage, his Honour's expressed understanding does not accurately reflect the law. For mental illness or a psychiatric condition to be relevant to sentencing it is not necessary that it be the cause of the commission of the crime. Indeed, authority suggests that it is not necessary that it be a cause of the crime. I refer to the decision of this Court in R v Fahda [1999] NSWCCA 267 at [40] - [48]. There reference was made to a number of authorities of which the following are, on this issue, relevant. In R v Letteri (unreported, NSWCCA, 18 March 1992), Badgery-Parker J said:
"In each of those cases [which he had, in the preceding paragraph, cited], it appears that the mental illness or retardation was a factor inducing the commission of the offence but that is not a necessary condition of the application of the principle ." (emphasis added)
37 In R v Engert (1995) 84 A Crim R 67 Gleeson CJ said:
"In truth, however, ... the question of the relationship, if any, between the mental disorder and the commission of the offence, goes to circumstances of the individual case to be taken into account in the application of the relevant principles. The existence of such a causal relationship in a particular case does not automatically produce the result that the offender will receive a lesser sentence, any more than the absence of such a causal connection produces the automatic result that an offender will not receive a lesser sentence in a particular case . For example, the existence of a causal connection between the mental disorder and the offence might reduce the importance of general deterrence, and increase the importance of particular deterrence or of the need to protect the public. By the same token, there may be a case in which there is an absence of connection between the mental disorder and the commission of the offence for which a person is being sentenced, but the mental disorder may be very important to considerations of rehabilitation, or the need for treatment outside the prison system ." (emphasis added)
38 A mental disorder such as the applicant's depression was identified by Gleeson CJ in Engert as being part of the circumstances of the individual case. Generally speaking, the well-known authorities indicate that mental disorder may be relevant to the assessment of the offender's culpability and to the level to which it is appropriate to give greater or lesser emphasis to principles of general or specific deterrence: see also R v Scognamiglio (1991) 56 A Crim R 81; Letteri; R v Champion (1992) 64 A Crim R 244; R v Wright (1997) 93 A Crim R 48.
39 In my opinion it was an error for his Honour to direct himself in terms that suggested that the applicant's depression, if not causative of his offences, was irrelevant to the sentencing process. The result was unduly to confine the sentencing discretion. There can be no doubt that he excluded it as a relevant sentencing factor; he said so explicitly. Applying the balancing considerations proposed by Gleeson CJ to the present case, it can be seen, on the facts of this case as found by the sentencing judge, that protection of the community is not a consideration suggesting a greater rather than a lesser sentence. The finding concerning rehabilitation establishes so much. In my opinion the applicant was entitled to have his mental state taken into account as a relevant sentencing consideration, and one going to mitigation, not exacerbation, of sentence.
40 That is so even if the finding of fact, that the depression had no causal connection with the offence, is accepted as correct. The correctness of the finding of fact was the basis of the first ground of appeal as pleaded and as originally argued. It is a finding of fact with which I have great difficulty. It is true that Dr Westmore accepted that it was difficult to make a retrospective diagnosis, but a fair reading of his report makes it quite clear that he did consider that the applicant was depressed; and the circumstances of the case are such that the depression arose directly from his matrimonial and family circumstances.
41 But the influence of the depression must remain in perspective. In Wright, Hunt CJ at CL (as the presiding judge then was) said:
"But, if the offender acts with knowledge of what he is doing and with knowledge of the gravity of his actions, the moderation [in sentence] need not be great."
42 Here, it must be accepted that the applicant, although acting out of depression, also acted with knowledge of what he was doing and of the gravity of his actions. That gives some guide to the extent to which his depression ought to have been taken into account in mitigation of sentence. In the circumstances of this terrible crime, it cannot weigh too heavily.