Facing sudden historical upheavals and approaching dangers, the nations of the world are gripped by panic and band together in desperate cooperation. This sudden unity stems from a deep fear of an impending threat, specifically the rise of Cyrus, King of Persia. In their terror, the nations hope that by increasing their idol worship, they might be saved from his conquest [אבן עזרא]. Others view this frantic gathering as a preparation for war, driven by the hope that their gods will stand by them in their time of trouble [רש״י].
The frantic activity paints a mocking and vivid picture of those who worship idols. Although they witness the wonders of God, they completely fail to recognize the truth. Instead, they are overcome with anxiety over the fate of their lifeless statues. Terrified that their idols might collapse, they rush to help one another build and reinforce these physical figures [שד״ל, מצודת דוד]. This mutual assistance creates a unique dynamic of dependency. Everyone is forced to cooperate to such an extent that even the person receiving help is actively assisting the one who came to support him [צפנת פענח, ביאור שטיינזלץ].
The sheer scale of this mass mobilization alters normal human relationships. The primary approach among commentators views the interaction between a neighbor and a brother as a reflection of widespread, unified effort [רד״ק, מצודת דוד]. However, the extreme nature of the crisis fundamentally changes how people treat one another. Under normal circumstances, a person might not fully commit to helping a neighbor, yet here they assist each other with intense energy. Conversely, human nature usually dictates that a person pities his brother and tries to do the hard work for him. Yet, the current distress is so severe that a person must tell his own brother to be strong and make an effort for himself, as the danger is too great to rely entirely on the help of others [מלבי״ם].