The haftarah for Tisha B’Av is taken from Jeremiah 8:13-9:23. It begins with a description of chaos and the enemy’s advent. We hear the voice of the people seeking refuge in fortified city and the voice of God ordaining their affliction. From verse 18 the text shifts to the first person singular. According to most commentators, it is the prophet himself speaking: “Would that my head were water and my eye a fountain of tears that I might weep day and night for the dead of my people (8:23).”
The next verse continues: “Would I were a wayfarer’s inn in the desert, that I might abandon my people and go from them for they are all adulterers, an assembly of traitors etc.” Why does the prophet wish to separate himself from the Jewish people? One reason, offered by commentators, is that he cannot bear to see their suffering. Offhand this reason is supported by the previous verses in which he laments the inexhaustibleness of his grief.
However, if we look at the prophet’s wish in connection with the following verses, it appears that he is disgusted by their sinfulness. His desire to flee is not necessarily a rejection of the people, but it is surely a rejection of their corrupt society. He does not want to dwell in a community of deception.