The most ancient moral burden was on Lot’s wife. Her husband had a mere supporting role.
The Angels told them don’t look back. She looked back. It seems that her mistake was “not letting go” of the doomed city.
The lesson is still current ~ today's modern woman doesn't work with her daughters in regard to picking out husbands, so the daughters go to the beerjoints downtown to try out the available stock. See what happens when you reject God's ancient laws!