That's why it's all dead there. Sodom was the place where Tumah and evil resided. As mentioned last week, it was the potential kedushah of Sodom that attracted the tumah to it. Lot married a Sodomitess and had two daughters. Comes the impending doom.
Mom turns to salt.
The daughters think they are the sole survivors of a global destruction and sleep with dad for the sake of mankind. It is the time now approaching, the 9th of Av. The Gemorah says the Mashiach will be born on the 9th of Av. This is it's potential. In the mean time it became a day of mourning and fasting.