The severe consequence of scattering the nation among foreign lands was not a sudden reaction to a single misstep. Rather, it was the climax of a long, tragic pattern of spiritual decay. The harsh decree of exile was completely fitting and fully justified [מלבי״ם].
The devastation that struck the people was not the result of one specific sin, but stemmed from an accumulation of wrongs and a consistent failure to follow God's laws and statutes [מצודת דוד]. Beyond simply abandoning the commandments, the people developed a deep attraction to the idolatry practiced by their ancestors. These false practices were utterly repulsive and abominable, likened even to the foulness of physical waste [מצודת דוד].