The Book of Mormon passages may be scanned in two sections. The first has a chiastic form. The second set is a repeated parallel. The presence of two different types of parallelism suggests poetic elements but without a controlling overall poetic structure. That is, there is clearly a single theme, and these verses clearly belong together. They do not, however, form a cohesive poetic structure.
In the first parallel set, the emphasis is on the comparison between the New and Old worlds, both of which have “fallen.” In the New World, it is literal: people and cities. In the Old World, it was metaphoric: Israel who rejected its Messiah.
The second set of parallels contrasts the Old World and the New. The Old World is “ye that dwell at Jerusalem, as ye that have fallen.” In the New World, the address is to “ye house of Israel whom I have spared.” The contrast is heightened by the opposition of the “ye would not” and the “if ye will repent and return.”
Even though the entire section does not have a poetic structure, the combination of paralleled and contrasting elements is interesting. The first stanza presents a chiastic structure of opposition with parallelism in the meaning. The second stanza displays structural parallelism but opposite meanings.