A city's moral decay is most visible in how its people treat the foundations of their society and their most vulnerable populations. These particular sins mirror the severe warnings given to the Israelites in the Torah portion of Kedoshim [רש״י].
The breakdown begins within the family unit, where fathers and mothers are treated with deep disrespect and contempt [מצודת ציון, ביאור שטיינזלץ]. Such behavior represents a profound failure of character. Basic human logic and natural morality dictate that a person should honor their parents and avoid these offenses naturally, even if the Torah had never explicitly issued a Commandment against them [רד״ק, צאינה וראינה].
Beyond the home, this corruption spreads to the treatment of society's most defenseless members. Everyday business dealings and interactions with foreigners are marked by exploitation, robbery, pressure, and harassment [מצודת דוד, ביאור שטיינזלץ]. The foreigner is targeted specifically because of their social vulnerability, lacking a network of relatives or allies to offer protection [רד״ק].
Orphans and widows face similar cruelty. Instead of receiving the support they desperately need, they are harassed and financially ruined through fraud and extortion [מצודת ציון, ביאור שטיינזלץ]. Their exploitation is a direct result of their fragile status in society, as they have lost their natural protectors and support systems with the absence of a father or a husband [רד״ק].