2 The Lord hath swallowed up all the habitations of Jacob, and hath not pitied: he hath thrown down in his wrath the strong holds of the daughter of Judah; he hath brought them down to the ground: he hath polluted the kingdom and the princes thereof.
[AD 339] Eusebius of Caesarea on Lamentations 2:1-2
No envy hindered the progress of these affairs that advanced gradually and grew and increased day by day. Nor could any evil demon slander them or hinder them through human counsels, so long as the divine and heavenly hand watched over and guarded his people as worthy.But on account of the abundant freedom, we fell into laxity and sloth. We envied and reviled each other and were almost, as it were, taking up arms against one another. Rulers assailed rulers with words like spears, and people forming parties against people and monstrous hypocrisy and dissimulation rising to the greatest height of wickedness, the divine judgment with forbearance, as is its pleasure, while the multitudes yet continued to assemble, gently and moderately harassed the episcopacy.
This persecution began with the brothers in the army. But as if without sensibility, we were not eager to make the Deity favorable and propitious; and some, like atheists, thought that our affairs were unheeded and ungoverned; and thus we added one wickedness to another. And those esteemed our shepherds, casting aside the bond of piety, were excited to conflicts with one another and did nothing else than heap up fights and threats and jealousy and enmity and hatred toward each other, like tyrants eagerly endeavoring to assert their power. Then, truly, according to the word of Jeremiah, “The Lord in his wrath darkened the daughter of Zion, and cast down the glory of Israel from heaven to earth and remembered not his footstool in the day of his anger. The Lord also overwhelmed all the beautiful things of Israel and threw down all his strongholds.”
And according to what was foretold in the Psalms, “He has made void the covenant of his servant, and profaned his sanctuary to the earth—in the destruction of the churches—and has thrown down all his strongholds and has made his fortresses cowardice. All that pass by have plundered the multitude of the people; and he has also become a reproach to his neighbors. For he has exalted the right hand of his enemies, and has turned back the help of his sword and has not taken his part in the war. But he has deprived him of purification and has cast his throne to the ground. He has shortened the days of his time, and besides all, has poured out shame on him.”
All these things were fulfilled in us when we saw with our own eyes the houses of prayer thrown down to the very foundations. We saw the divine and sacred Scriptures committed to the flames in the midst of the marketplaces and the shepherds of the churches basely hidden here and there, and some of them were captured ignominiously and mocked by their enemies. When also, according to another prophetic word, “Contempt was poured out on rulers, and he caused them to wander in an untrodden and pathless way.”

[AD 1274] Thomas Aquinas on Lamentations 2:2
Those events occurring around destruction are viewed here in particular. First, are lamented those events conjoined to the destruction, second, those events following. Onward in Verse 13 such is expressed: "What can I say for you, to what compare you, O daughter of Jerusalem?" etc.

As to events joined to destruction two ideas are advanced. First is bewailed the destruction of common edifices, second, the eminent edifices. As later Verse 6 comments: "He has broken down his booth like that of a garden, laid in ruins the place of his appointed feasts."

Regarding destruction of common edifices two further ideas are proposed. First is bewailed destruction itself, that pertains to the king's might, second, what pertains to the people's use. As further on Verse 4 says: "He has bent his bow like an enemy; with his right hand set like a foe; and he has slain all the pride of our eyes in the tent of the daughter of Zion; he has poured out his fury like fire."

To the very destruction itself of edifices two more notions are set forth. First is bewailed destruction itself, second, the unavailing resistence. As Verse 3 states: "He has cut down in fierce anger all the might of Israel; he has withdrawn from them his right hand in the face of the enemy."

Three more ideas are again proposed as to destruction itself. First is lamented events that relate to decorum and dignity. Verse 2 thus says: "The Lord has destroyed without mercy all the habitations of Jacob." And, the prophet Joel 1:19 declares: "Unto thee, O Lord, I cry. For fire has devoured the pastures of the wilderness."

Second is lamented events pertaining to fortitude and courage. As Verse 2 continues: "in his wrath he has broken down the strongholds of the daughter of Judah. While the prophet Isaiah 25:12 says: "And the high fortifications of his walls he will bring down, lay low, and cast to the ground, even to the dust." Also, Jeremiah 33:4 records: "For thus says the Lord, the God of Israel, concerning the houses of this city and the houses of the kings of Judah which were torn down to make siege mounds and before the sword."

Third, the violent detriment of the kingdom is ended.

As Verse 2 concludes: "he has brought down to the ground in dishonor the kingdom and its rulers." The prophet Ezekiel 28:8 exclaims: "They shall thrust you down into the Pit, and you shall die the death of the slain in the heart of the seas."