It is implied that "do not understand" means they ignore or do not honor Yahweh's works. Alternate translation: "they do not regard with honor what Yahweh has done" (See: [[rc://en/ta/man/jit/figs-explicit]])
The punishment of the wicked people is spoken of as if they were a building or a city that God would destroy. (See: [[rc://en/ta/man/jit/figs-metaphor]])