The spiritual and political decline of the Kingdom of Judah reaches a tragic point of no return when her transgressions are committed openly and without a trace of shame. This public display of wrongdoing is likened to a deliberate uncovering, an act done specifically to excite and attract foreign lovers [מצודת ציון]. Her blatant actions are meant to draw in these foreign powers without any sense of embarrassment or restraint [מלבי״ם, מצודת דוד].
These transgressions operate on two complementary levels. On a religious level, Judah engages in public idolatry, openly chasing after foreign gods. She is particularly drawn to the Chaldeans, eagerly adopting their idols [רד״ק, מצודת דוד, מלבי״ם]. On a political level, this behavior represents a deep moral betrayal. Judah attempts to weave alliances with enemy nations, most notably by breaking the solemn oath that the King of Babylon forced upon Zedekiah, the King of Judah [רד״ק, ביאור שטיינזלץ].
In response to such brazen defiance, God reacts with severe distance. He completely severs His divine connection, withdrawing His presence, favor, and love from Judah. Because God is thoroughly disgusted by her actions, she is left entirely unprotected and abandoned to her enemies. This withdrawal paves the way for the King of Babylon to destroy the city and send its inhabitants into exile [רד״ק, מצודת דוד, אברבנאל].
This harsh punishment and the removal of the Divine Presence mirror exactly what happened to Judah's sister, the Kingdom of Samaria of the Ten Tribes, which was also rejected by God and sent into exile. Yet, instead of learning a moral lesson from her sister's devastating fate and choosing to repent, Judah makes the opposite choice. She continues to multiply her sins, turning back to seek out old, forbidden alliances with Egypt [מלבי״ם, אברבנאל, ביאור שטיינזלץ].