The destruction of Jerusalem was not a random tragedy, but the precise and absolute fulfillment of a divine plan. Human nature often dictates that an angry person might vent their frustration through words alone, ultimately holding back from taking physical action. God, however, carried out the full extent of His thoughts and anger [לחם דמעה].
There is general agreement among commentators that the ancient warnings fulfilled during the destruction refer to the rebukes and disasters originally outlined in the Torah [רש״י, ביאור שטיינזלץ]. Expanding on this, others note that God brought upon Israel not only the curses written in the text, but also harsh decrees that existed only in His thoughts and were never formally recorded [לחם דמעה, אלשיך].
The execution of these decrees is understood in several distinct ways. The primary approach among commentators is one of total finality, noting that God fully completed and exhausted all of His planned judgments [רש״י, אבן עזרא]. A second perspective suggests a division of prophecies. In this view, God split His promises, fulfilling only the harsh prophecies while leaving the words of comfort unrealized [לחם דמעה]. Similarly, God divided His ancient promise to Abraham. While the decree of subjugation was applied to all future exiles, the promise to judge and punish the oppressing nation was reserved solely for the exile in Egypt. Consequently, the current enemy is able to celebrate without any fear of divine retribution [אלון בכות].
A third approach finds a measure of comfort in the destruction, viewing God's actions as a compromise. Despite the severity of the ruin, God did not completely wipe out Israel. He brought disease and suffering upon them, but halted His decree just moments before total annihilation [תורה תמימה, אלשיך]. A fourth, highly vivid interpretation envisions God acting like a mortal king mourning his dead. In His profound grief over the destruction, God figuratively tears His royal garment. The tearing of this divine garment, which bears the engraved images of the martyrs, is what ultimately atoned for the sins of the Israelites and saved them from complete destruction [תורה תמימה, אלון בכות].
As part of this judgment, God empowered Israel's oppressors, elevating them to leadership and causing even passive enemies to rejoice in Jerusalem's downfall [ביאור שטיינזלץ, לחם דמעה]. Usually, when an enemy gloats, God becomes angry with them and redirects the punishment onto the oppressor. In this instance, however, God bypassed that rule in order to exact full justice upon Israel [לחם דמעה, אלון בכות]. Yet, even within this gloating, a double layer of comfort remains hidden. First, the very fact that God causes others to rejoice indicates that He Himself finds no joy in their defeat; rather, He dwells with them in their sorrow and exile [תורה תמימה]. Second, the joy of the enemy, their rise to power, and the physical destruction of buildings and stones served a vital purpose. They absorbed the brunt of the divine wrath, acting as the very compromise that spared the Israelites themselves from total annihilation [אלשיך].