The absolute destruction of the Land of Israel sparks universal shock. When the nations of the world look upon the desolation of the land, or encounter the scattered Israelite exiles living among them, they will immediately understand that this is no random natural disaster. Instead, they will recognize it as a deliberate strike by God against a land that previously enjoyed His constant care [ספורנו, ביאור יש״ר].
This realization prompts a profound, twofold question from the observing nations. First, they ask what specific crime could have possibly triggered such a terrible ruin. Second, they wonder why the punishment is so incredibly severe, prolonged, and seemingly out of proportion [הטור הארוך, מלבי״ם]. The anger described here represents a massive Divine wrath [ביאור שטיינזלץ]. Some connect the concept of this anger to the baking of exceptionally thick cakes, which require a tremendous, roaring fire. This paints a vivid picture of the sheer intensity of the rage and fire that consumed the land [תורה תמימה]. Furthermore, unlike a human king who dispatches messengers to carry out a punishment, in this case, it is God's wrath and anger themselves that directly strike and destroy [אדרת אליהו].
The intense confusion of the nations stems from a simple comparison with their own circumstances. Looking at a land scorched with sulfur and salt, completely unable to grow anything, they struggle to make sense of the underlying cause [בכור שור]. They reason that if the Israelites were being punished for severe moral failings like murder, adultery, or the kind of social cruelty seen in Sodom, the punishment does not add up. The nations know the Israelites never sank to such depths, and other societies have plenty of criminals without their homelands being turned into wastelands [העמק דבר, רא״ש, דעת זקנים, חתם סופר]. Conversely, if the sin was idol worship, the nations are equally puzzled, as they themselves worship idols yet do not suffer such catastrophic exile and destruction [העמק דבר, שפתי כהן, בכור שור].
The answer to this deep universal shock lies in the unique covenant between God and His people. Other nations are simply following the traditions of their ancestors when they worship idols. The Israelites, however, personally experienced the exodus from Egypt, received enormous kindness from God, and willingly entered into a binding agreement with Him. Because of this history, abandoning their faith is not merely a religious offense. It is an act of profound ingratitude and a direct betrayal of their commitment. This deep betrayal is exactly what justifies a level of strict judgment and severe punishment that simply does not apply to the rest of the world [רא״ש, שפתי כהן, חתם סופר].