Thomas Aquinas Commentary Lamentations 4:14

"They wander as blind men in the streets, they are polluted with blood, So that men cannot touch their garments." — Lamentations 4:14 (ASV)

Second, he presents their lack of repentance, because they thought they were doing enough simply by staying away from the temple entrance. They have wandered, roaming through the streets as blind men. For, as it is written, these things they thought, and were deceived: for their own malice blinded them . They were walking in it (the temple), and their skirts (lacinias) were cut in the style of jesters—a style called “lacerated” from lacero. This shows that they did not give up their pleasures.

Alternatively, according to a variant text, the phrase is their wantonness (lascivias), and this reading is clearer. For your hands are defiled with blood, and your fingers with iniquity (Isaiah 59:3).

This can also be explained in reference to captives who were physically blinded by their enemies. They could not enter their homes by themselves without holding the end of a guide’s garment, and this interpretation fits with what follows.