The defendant was convicted of mail fraud and related federal crimes arising from his operation óf a Ponzi scheme between 1991 and 1996, and Was sentenced to 70 months in prison. The scheme involved the sale of securities in Dyer’s sham or nonexistent corporations and imposed losses on its mostly elderly yictims of more than $2 million. The appeal challenges the district judge’s refusal to give Dyér a downward departure on the basis of section 5K2.13 of the federal sentencing guidelines, which provides that “a sentence below the applicable guideline range may be warranted if the defendant committed the offense while suffering from a significantly reduced mental capacity.” A refusal to grant a downward departure is unreviewable unless the refusal is based on a legal error, e.g.,
United States v. Thomas,
Nothing in U.S.S.G. § 5K2.13 or the cases construing it imposes the burden that Dyer faults the district judge for not having shouldered. The guideline is permissive rather .than mandatory. Even if the judge finds that the defendant committed the offense while afflicted by a significantly reduced mental capacity, he is not required to reduce the defendant’s sentence; he is merely authorized to do so, *570 and his exercise of that authority is unre-viewable.
All this is clear enough, and we write only because of the confused discussion in the briefs and at argument of the question whether section 5K2.13 requires the judge to determine, as a precondition to granting a downward departure on the basis of the defendant’s mental condition, whether that condition was a “but for” cause of his criminal conduct. A judge who thought the guideline does require such a determination was reversed in
United States v. Ruklick,
“But for” causation is a very weak sense of causation; in fact, it often falls short of the meaning of “cause” in ordinary usage. It is poles apart from “sole cause,” as innumerable cases in other areas of the law make clear. E.g.,
Greater Rockford Energy & Technology Corp. v. Shell Oil Co.,
The principal objectives of criminal punishment that guide the design and application of the federal sentencing guidelines are retribution, deterrence, and incapacitation. See 18 U.S.C. §§ 3553(a), (b);
United States v. Heffernan,
So there has to be some causal connection between the defendant’s mental condition and his criminal conduct in order to warrant a punishment discount under any plausible set of penal goals. Yet judicial reluctance to acknowledge a but-for requirement in section 5K2.13 is a fact, and it is a fact that, we think, reflects the uncertainty that plagues efforts to determine the causal éffect of mental disease. It was this that led the district court in
United States v. Royal,
■The determination of. causality was in any event the judge’s determination to make, not ours; so our agreement with his determination is no more relevant than our disagreement with it would be. He committed no legal error in refusing to depart downward, and the appeal is therefore
Dismissed.
