The spiritual betrayal committed by the tribes is presented not merely as a sin, but as an act lacking basic logic. Instead of remaining loyal to God, the God of their ancestors, the tribes chose to rebel and stray after the local deities [ביאור שטיינזלץ].
The primary approach among commentators highlights a bitter irony in this choice. The tribes were tempted to worship the idols of the exact same nations that God had already destroyed before them. This situation reveals a shocking blindness on their part. They should have realized that if these foreign idols were so powerless that they could not even save their own people from destruction, they certainly would not be able to provide any help or salvation to the Israelites.