The absolute destruction of the land is not a random disaster, but a deliberate act by God designed to awaken the people to His providence and justice. A profound realization will eventually take hold among the nation, bringing them to understand that God is faithful in delivering justice and punishing sins [מצודת דוד].
This clarity will emerge when the people recognize that the total desolation of their homeland is a precise, providential punishment directed exactly at their wrongdoings [מלבי״ם]. The ruin they experience is not accidental, but a direct consequence of their own choices. The wasteland left behind comes as a direct result of all the terrible acts and evil deeds they committed [מצודת דוד, ביאור שטיינזלץ].