A profound and absurd betrayal lies at the heart of the prophetic rebuke against the Israelites. Abandoning faith in God for idolatry is not merely a matter of disloyalty. It is a tragic mistake in which an infinite source of life is traded for a useless, broken substitute that demands exhausting and pointless effort. The primary approach among commentators is that the core of this failure is a double evil. If the people had exchanged God for an equal power, it would have been a single failure of abandonment. However, because they traded their Creator for inferior, worthless idols, the failure is twofold [רש״י, מצודת דוד, צאינה וראינה]. Another perspective views these two evils as a combination of omission and commission. Turning away from God represents the neglect of positive commandments, while the active pursuit of idols represents the deliberate violation of prohibitions [צווארי שלל]. This active pursuit is deeply puzzling. Typically, someone who abandons the right path prefers to sit idle. Yet, in this case, the people go out of their way to work tirelessly at doing wrong [חומת אנך].
To illustrate the sheer foolishness of this choice, a comparison is drawn from the world of water. God is likened to a natural spring of living water. A spring flows on its own, never ceases, and does not depend on any outside source [רד״ק, צאינה וראינה]. In stark contrast, idolatry and reliance on political alliances with foreign nations like Assyria and Egypt are compared to dug out pits or cisterns. A cistern cannot produce water. It can only collect rain from elsewhere, making its supply limited and temporary. Worse still, these are cracked and broken cisterns. They cannot hold even the small amount of water they manage to gather. The water simply seeps through the cracks, causing the walls to crumble and leaving those who rely on them completely empty-handed [רש״י, רד״ק, ביאור שטיינזלץ].
The physical act of carving out these cisterns highlights another layer of tragedy. Hewing involves grueling labor, cutting into solid rock and stone rather than digging in soft dirt [מצודת ציון, מלבי״ם]. While the fresh water of a natural spring is readily available and flows effortlessly, the people choose to endure grueling labor, carving into hard stone for absolutely no benefit. They willingly abandon a life of Torah and Commandments, which is close and accessible, and instead invest massive effort in stubbornly chasing physical desires and sins that ultimately lead only to disappointment and emptiness [צווארי שלל].
On a deeper level, this failure stems from an attempt to escape God's direct supervision. While other nations are guided by the natural order and the stars, the Israelites are sustained directly by God's infinite abundance. Fearing the overwhelming, unlimited power of this direct connection, they sought out a more limited, natural system of leadership through the stars and heavenly forces. However, these forces of nature are exactly like broken cisterns. They are completely incapable of holding or sustaining the true power of God's abundant flow [אהבת יהונתן].