A severe spiritual and moral decline led the nation into extreme actions, causing them to ignore warnings and invite harsh consequences. The people completely strayed from the straight and proper path [מצודת ציון, שטיינזלץ], acting much like an unfaithful wife who betrays her husband [רד״ק, אברבנאל]. This betrayal represented a deep entrenchment in their wicked schemes.
This moral decay manifested in profound ways. One perspective suggests that the nation plunged into idolatry, actively slaughtering sacrifices to false gods [מצודת דוד, רד״ק, שטיינזלץ]. In this view, while the kings initially only blocked the people from traveling to the Temple, the citizens themselves willingly chose an evil path and embraced idol worship [מצודת דוד, אברבנאל]. Alternatively, the descent into wickedness involved literal bloodshed and murder [שטיינזלץ]. The kings stationed guards along the main roads to prevent travel to Jerusalem for the festival pilgrimages. When devoted individuals tried to bypass these roadblocks by traveling deep into hidden valleys, the king's men ambushed and brutally slaughtered them [אבן עזרא, מלבי״ם, אברבנאל]. In doing so, the kings took their decrees further than God Himself; while God established the pilgrimage as a positive Commandment, the corrupt leadership imposed a death penalty for those who tried to fulfill it [רש״י, אברבנאל]. Another concept suggests that the sinners simply dragged out and prolonged their foolish behavior over time [רש״י].
In the face of such deep corruption, a response was inevitable. The primary approach among commentators is that God Himself delivers a message of impending punishment and suffering. Because no action is hidden from His sight, God declares that He will bring severe consequences upon all the transgressors—both the kings who designed the sinful policies and the common people who carried them out [רש״י, מצודת דוד, אבן עזרא, שטיינזלץ]. Conversely, another approach understands the prophet himself to be the speaker, acting as a man of moral reproof. He testifies that he stands every day, urging all factions of the nation to return to the right path. By constantly delivering these warnings, the prophet ensures that the sinners can never claim they were unaware or unguided, even as they stubbornly shut their ears and refuse to listen [רד״ק, מלבי״ם, אברבנאל].