I think you are missing the point here...God is judging the NATION just like he judged Israel, not the individual Christian or even a city like Sodom...(San Fran)
When the Assyrians destroyed the Northern Kingdom...I am sure there were ten righteous Jews...God destroyed them because as a NATION they did not repent of their evil ways..
Apples and oranges. The nation of Israel is like no other nation ever. This nation was established on an oath made by each of the Israelite's at Mt Sinai. The entire nation made a promise to God. The nation of Israel has been the subject of discipline, not final judgement. The nation of Sodom was judged by God because of its total immorality despite it never making such a commitment that Israel made.
Under the grace of Jesus Christ, it is not about nations. It is about individuals accepting Christ. Unlike Israel, that made a corporate pledge to God. We as Christians do not make a pledge and we do not make it corporately. We merely accept. The Holy Spirit does the work.