TR?
How it started:
וַיִּשָּׂא־ל֣וֹט אֶת־עֵינָ֗יו וַיַּרְא֙ אֶת־כׇּל־כִּכַּ֣ר הַיַּרְדֵּ֔ן כִּ֥י כֻלָּ֖הּ מַשְׁקֶ֑ה לִפְנֵ֣י ׀ שַׁחֵ֣ת ה' אֶת־סְדֹם֙ וְאֶת־עֲמֹרָ֔ה כְּגַן־ה' כְּאֶ֣רֶץ מִצְרַ֔יִם בֹּאֲכָ֖ה צֹֽעַר׃
Lot raised his eyes and saw the entire Jordan Plain, that it was [an] abundantly watered [place]; before Hashem destroyed Sedom and Amorah, it was like Hashem’s garden, like the land of Egypt, going towards Zoar.
How it ended:
וַיַּשְׁקֵ֗ף עַל־פְּנֵ֤י סְדֹם֙ וַעֲמֹרָ֔ה וְעַֽל־כׇּל־פְּנֵ֖י אֶ֣רֶץ הַכִּכָּ֑ר וַיַּ֗רְא וְהִנֵּ֤ה עָלָה֙ קִיטֹ֣ר הָאָ֔רֶץ כְּקִיטֹ֖ר הַכִּבְשָֽׁן׃
He [Avraham] stared at Sedom and Amorah, and the whole land of the plain, and he saw the heavy smoke rising from the earth like the smoke of a furnace.
People say it was the riots that ruined it:
וְאַנְשֵׁ֨י הָעִ֜יר אַנְשֵׁ֤י סְדֹם֙ נָסַ֣בּוּ עַל־הַבַּ֔יִת מִנַּ֖עַר וְעַד־זָקֵ֑ן כׇּל־הָעָ֖ם מִקָּצֶֽה׃
The men of Sedom, surrounded the house—young and old alike—all the people from one end [of the city] to the other end.
Although the riots must have been symptomatic of a deeper moral decay that underlied the explosive turn of events.