Ammon is destroyed because it drove the people of the tribe of Gad from their homeland. This remembers the promises of the covenant Yahweh made with Abraham to curse those who curse Abraham's descendants. The purpose of these rhetorical questions is to convict those Yahweh addresses. The ULB sets the lines in 49:1-11, 14-27, 29-33, 37-39 farther to the right on the page than the rest of the text because they are part of a long quotation.