The collapse of the Kingdom of Judah was not a random event; it was the direct result of its leadership. God humbled the nation and allowed them to be subdued by their enemies specifically because of the destructive actions of King Ahaz [ביאור שטיינזלץ].
The king had a devastating influence on his people, though commentators understand the exact nature of this impact in two distinct ways. One perspective suggests that he fostered a culture of absolute shamelessness. Under his rule, the nation's sins and evil deeds were no longer hidden but were committed openly and with great publicity, effectively exposing their moral disgrace to the world [רש״י, רד״ק, מצודת ציון, מצודת דוד]. A contrasting viewpoint argues that his influence was rooted in active corruption and the deliberate disruption of order [ביאור שטיינזלץ]. According to this approach, Ahaz intentionally worked to abolish the observance of the Torah's commandments, aggressively inciting the people to violate divine prohibitions [רלב״ג].
Beyond the widespread spiritual damage he inflicted on the nation, the king bore a profound personal guilt. He did not merely lead the masses astray; he personally sinned and committed a direct, blatant betrayal against God [מצודת דוד, ביאור שטיינזלץ].