Certainly, this can happen in some cases, at least accidentally. Suppose our madman intends to start World War III, believes that he will start World War III only if he intends to launch a nuclear missile, but refuses to intend to launch a nuclear missile.  The Violation Claim might be explained in this case by pointing out that, whatever his other attitudes may be, he ought not to have the intention to start World War III, but does have that intention.  But why should we suppose that, in general, whenever one has an instrumentally incoherent set, one either has an attitude (or pattern) that one ought not to have, or lacks an attitude (or pattern) that one ought to have?