What the Bible says about Moab's Wrath as Excessive
(From Forerunner Commentary)
Pride and wrath are often present together, a major reason why pride leads to fighting. The degree of wrath is not the issue, only that it is present. In this context, the wrath of Moab is notable because it is excessive and unjustified (see Amos 2:1).
John W. Ritenbaugh
Pride, Humility, and the Day of Atonement