For all this; i.e. though Judah had seen the punishment of apostate Israel (Jeremiah 3:7, Jeremiah 3:8). So Rashi, Naegelsbach, Payne Smith. Most commentators suppose the phrase to refer to Judah's obstinate wickedness (Jeremiah 3:9), but this gives a weak sense.
"Judah defiled the land, etc; and yet notwithstanding her repentance was insincere"—this is by no means a natural sequence of ideas. The right exposition increases the probability of the correction proposed at the beginning of Jeremiah 3:8.