Genesis 19

You'll have to excuse my French, and take my word for it when I say I'm not trying to be offensive, but rarely in the course of literature has the term 'total f**king insanity' enjoyed such a literal meaning as in Genesis 19. It's a Hollywood movie of a chapter, total madness; sex, explosions, drugs... it's hard to believe it's actually in the bible (it's pretty much the beginning of the bible!). Right off the bat it seems shocking that a post-diluvian god could find it in himself to be so wrathful just all of a sudden. God has decided that he's going to destroy the cities of Sodom and Gomorrah, as they are completely full of sinners. In the chapter right before this Abraham is talking to God asking him why he would do this, because what if there were just 40, or 30, or even 10 pious people living there. God agrees and says that if there are even 10 good people living there that he won't destroy the cities, although, nothing seems to come of this and right at the beginning of the next chapter God sends 3 angles to earth with the full intention of destroying the cities. The angels are greeted by Lot (who how did he end up here?). The thing that struck me when I was reading Genesis 19 was that none of the characters who did something even relatively important, not one, were somehow redeemable, or had good qualities. Lot offers his two daughters to a whole hormonally-crazed mob of rapists just so they won't attack the angles that were sent down to him. Then, after the cities are destroyed, Lot's two daughters get him drunk and rape him. Incest. Incest re-populates a whole new city of people. How is this moral? Genesis 19 doesn't offer a redeeming quality other than the notion that God is petty, and if he doesn't get his way, or is somehow displeased even just a little bit, then he will just destroy you. Even Lot's wife gets turned into a pillar of salt just for looking back at her burning home. What lesson does this teach, other than God is just a little bit petty?