Lamentations starts with a brutal truth of Jerusalem’s condition brought about by the abundant transgressions of the Jews.

The holiest city is not spared from G-d’s punishment.

Because they turned away from following the Torah.

More is underway…

“Jerusalem Is Afflicted”

Her adversaries have become [her] master, her enemies are at ease, for Hashem has afflicted her to abundant transgressions. …
1:5
Jerusalem sinned greatly, she has therefore become a wanderer. All who once respected her disparage her, for they have seen her disgrace. She herself sighs and turns away.
:8
Her impurity is on her herms, she was heedless of her end. … “See, O Hashem, my suffering, for the enemy has acted prodigiously!”
:9
The enemy spread out his hand on all her treasure; … [nations] about whom You had commanded that they should not enter Your congregation.
:10
Over these do I weep; my eye continuously runs with water because a comforter to restore my soul is far from me. …
:16
… Hashem commanded against Jacob that his enemies should surround him; Jerusalem has become as one unclean in their midst.
:17
Hashem is righteous, for I disobeyed His utterance. …
:18
… for it was You Who did it. …
:21
Let all their wickedness come before You, and anflict them as You inflicted me for all my transgressions. For my groans are many, and my heart is sick.
:22

1 O how has the city that was once so populous remained lonely! She has become like a widow! She that was great among the nations, a princess among the provinces, has become tributary.
2 She weeps, yea, she weeps in the night, and her tears are on her cheek; she has no comforter among all her lovers; all her friends have betrayed her; they have become her enemies.
3 Judah went into exile because of affliction and great servitude; she settled among the nations, [and] found no rest; all her pursuers overtook her between the boundaries.
4 The roads of Zion are mournful because no one comes to the appointed season; all her gates are desolate, her priests moan; her maidens grieve while she herself suffers bitterly.
5 Her adversaries have become the head, her enemies are at ease; for the Lord has afflicted her because of the multitude of her sins; her young children went into captivity before the enemy.
6 And gone is from the daughter of Zion all her splendor; her princes were like harts who did not find pasture and they departed without strength before [their] pursuer.
7 Jerusalem recalls the days of her poverty and her miseries, [and] all her precious things that were from days of old; when her people fell into the hand of the adversary, and there was none to help her; the enemies gazed, gloating on her desolation.
8 Jerusalem sinned grievously, therefore she became a wanderer; all who honored her despised her, for they have seen her shame; moreover, she herself sighed and turned away.
9 Her uncleanliness is in her skirts, she was not mindful of her end, and she fell astonishingly with none to comfort her. Behold, O Lord, my affliction, for the enemy has magnified himself.
10 The adversary stretched forth his hand upon all her precious things, for she saw nations enter her Sanctuary, whom You did command not to enter into Your assembly.
11 All her people are sighing [as] they search for bread; they gave away their treasures for food to revive the soul; see, O Lord, and behold, how I have become worthless.
12 All of you who pass along the road, let it not happen to you. Behold and see, if there is any pain like my pain, which has been dealt to me, [with] which the Lord saddened [me] on the day of His fierce anger.
13 From above He has hurled fire into my bones, and it broke them; He has spread a net for my feet, He has turned me back, He has made me desolate [and] faint all day long.
14 The yoke of my transgressions was marked in His hand, they have become interwoven; they have come upon my neck and caused my strength to fail; the Lord delivered me into the hands of those I could not withstand.
15 The Lord has trampled all my mighty men in my midst, He summoned an assembly against me to crush my young men; the Lord has trodden as in a wine press the virgin daughter of Judah.
16 For these things I weep; my eye, yea my eye, sheds tears, for the comforter to restore my soul is removed from me; my children are desolate, for the enemy has prevailed.
17 Zion spreads out her hands [for help], but there is none to comfort her; the Lord has commanded concerning Jacob [that] his adversaries shall be round about him; Jerusalem has become an outcast among them.
18 The Lord is righteous, for I have rebelled against His word; hear, I pray, all you peoples, and behold my pain; my maidens and my youths have gone into captivity.
19 I called to my lovers, [but] they deceived me; my priests and elders perished in the city, when they sought food for themselves to revive their souls.
20 Behold, O Lord, for I am in distress, my innards burn, my heart is turned within me, for I have grievously rebelled; in the street the sword bereaves, in the house it is like death.
21 They have heard how I sigh, [and] there is none to comfort me, all my enemies have heard of my trouble [and] are glad that You have done it; [if only] You had brought the day that You proclaimed [upon them] and let them be like me.
22 May all their wickedness come before You, and deal with them as You have dealt with me for all my transgressions, for my sighs are many and my heart is faint.