One possible answer comes from the later passage in Ezekiel 16:49-50.

49 Behold, this was the iniquity of thy sister Sodom, pride, fulness of bread, and abundance of idleness was in her and in her daughters, neither did she strengthen the hand of the poor and needy. 50 And they were haughty, and committed abomination before me: therefore I took them away as I saw good. Ezekiel 16:49-50 (KJV)

The later passage suggests that there were victims that would have cried out from within the city of Sodom.

One possible answer comes from the additional reasons given for judgment in the later passage in Ezekiel 16:49-50.

49 Behold, this was the iniquity of thy sister Sodom, pride, fulness of bread, and abundance of idleness was in her and in her daughters, neither did she strengthen the hand of the poor and needy. 50 And they were haughty, and committed abomination before me: therefore I took them away as I saw good. Ezekiel 16:49-50 (KJV)

The later passage suggests that there were victims that would have cried out from within the city of Sodom.

Verse 49 explains how there would have been victims and verse 50 explains that at the same time their sin was so grievous: their haughtiness (וַֽתִּגְבְּהֶ֔ינָה) and their abominations (תוֹעֵבָ֖ה).