The idea that Lot's incest was punishment for his willful sin in offering his own daughters to the mob is interesting. However, the commentary above says, "The daughters’ true intent was not to lie with their father, on whom they had no sexual designs, but to save the world from total devastation. The daughters thought that the entire world had been laid waste, as had happened during the Flood, since they saw no living souls wherever they went." The Torah says that Lot and his daughters (and his wife, before she became a pillar of salt) first fled to Zoar, which was not destroyed along with Sodom because of Lot's desire to live there. It was only afterwards, out of unspecified fear [whether because Lot thought it also would be destroyed, or because he feared its inhabitants for some reason], that Lot took his daughters to the hills to live in a cave. So it seems unlikely that his daughters would think the entire world was destroyed, especially when they saw no smoke or fire to the west of the Valley.
The idea that Lot's incest was punishment for his willful sin in offering his own daughters to the mob is interesting. However, the commentary above says, "The daughters’ true intent was not to lie with their father, on whom they had no sexual designs, but to save the world from total devastation. The daughters thought that the entire world had been laid waste, as had happened during the Flood, since they saw no living souls wherever they went." The Torah says that Lot and his daughters (and his wife, before she became a pillar of salt) first fled to Zoar, which was not destroyed along with Sodom because of Lot's desire to live there. It was only afterwards, out of unspecified fear [whether because Lot thought it also would be destroyed, or because he feared its inhabitants for some reason], that Lot took his daughters to the hills to live in a cave. So it seems unlikely that his daughters would think the entire world was destroyed, especially when they saw no smoke or fire to the west of the Valley.