I answer that, Since goodness is that which all things desire, and since this has the aspect of an end, it is clear that goodness implies the aspect of an end.... Beauty and goodness in a thing are identical fundamentally; for they are based upon the same thing, namely, the form; and consequently goodness is praised as beauty. But they differ logically, for goodness properly relates to the appetite (goodness being what all things desire); and therefore it has the aspect of an end (the appetite being a kind of movement towards a thing).
So this is a real problem, because now evil is the object of desire -- and therefore a good to be pursued. But that can't be, Aquinas has already told us.
No being can be spoken of as evil, formally as being, but only so far as it lacks being. Thus a man is said to be evil, because he lacks some virtue; and an eye is said to be evil, because it lacks the power to see well.
This is Augustine's point, which we were just discussing recently, and a place where Aquinas and Aristotle differ. Evil properly speaking can't exist for Aquinas; it is only a privation or a lack of something desirable, something beautiful, i.e. something good. To say that anger desires the lack of something desirable does not make sense.
It especially does not make sense given that anger is associated here with justice, and has been said to be partially governed by reason and mercy. Justice is a good, not an evil. Injustice is an evil, because it is the lack of something desirable, i.e. justice.
Human will, unlike God's, can be disordered and therefore sinful. If what anger desires is evil, though, it is very basically and radically disordered -- which is the opposite of what Aquinas has been arguing heretofore.


