Edmund Burke, 1729-1797, was credited with saying "The only thing necessary for the triumph of evil is for good men to do nothing." I don't think he said that exactly, but he did preach on the parliament floor of Great Britain a sermon that could be summarized with that quote.
So are you allowing evil to win? Are you doing nothing? What can we do? We can learn from Abraham to pray as he did in Chapter 18. We can stand against evil, by proclaiming what is truth, and by living a righteous life. We could involved in a Biblical church community, preaching the gospel, and sharing the good news of Jesus Christ. We can learn more about truth, and learn to discern what is evil. We must understand our times. Lot failed in all of these things, and is rescued, but rescued for Abrahams sake, not Lots. We must stand, or we will end up like Lot... chapter 20 is a very sad chapter.