Please ignore the fact that they had just witnessed fire coming down killing everyone they knew.
Perhaps they thought Lot was the last man standing?
Not that it matters. Please carry on with your mocking post.
why would that matter.
Besides the fact there is no evidence they thought they were the last humans standing. Zoar was a city and it was not destroyed, and that is where Lot and family went first.
19:20 Behold now, this city is near to flee unto, and it is a little one: Oh, let me escape thither, (is it not a little one?) and my soul shall live.
19:21 And he said unto him, See, I have accepted thee concerning this thing also, that I will not overthrow this city, for the which thou hast spoken.
19:22 Haste thee, escape thither; for I cannot do anything till thou be come thither. Therefore the name of the city was called Zoar.
19:23 The sun was risen upon the earth when Lot entered into Zoar.
So Lot and family were safe in Zoar when Sodom was destroyed.
Okay.
So at least one man in Zoar to slip the daughters of Lot the Sausage.
But...
19:30 And Lot went up out of Zoar, and dwelt in the mountain, and his two daughters with him; for he feared to dwell in Zoar: and he dwelt in a cave, he and his two daughters.
19:31 And the firstborn said unto the younger, Our father is old, and there is not a man in the earth to come in unto us after the manner of all the earth: