By “one wants” in the passage above, Kant means “one wills”: something closer to “one intends” than “one desires.” (After all, it wouldn’t be plausible to suggest that one is instrumentally irrational in not intending the necessary means to what one merely wants.  I want to own a BMW, but I don’t intend to work the kind of job that would allow me to buy one.  But there’s nothing incoherent about my continuing to desire to own one.)  According to Kant: