A profound moral and social collapse unfolds as a chain of grave sins dismantles the foundations of faith and society, plunging the nation into extreme violence and chaos. The deterioration begins with false oaths and deceit. Beyond simple dishonesty, this behavior reflects a deep-seated rejection of God and His divine providence, as the people deny the covenantal oaths they once accepted upon themselves [רד״ק, מלבי״ם]. Coupled with murder, theft, and adultery, these actions essentially uproot the Ten Commandments in their entirety. The deceit and heresy destroy the foundational duties between humanity and God, while the acts of violence and betrayal shatter the obligations between people [מלבי״ם].
As the sins multiply, the moral decay reaches a breaking point. The primary approach among commentators is that the people shattered every wall of morality, natural law, and religious observance, engaging in unrestrained and rampant wrongdoing [אבן עזרא]. Another perspective views this breaking point specifically as a descent into total sexual promiscuity. The people ignored all boundaries of forbidden relationships, to the extent of fathering children with the wives of other men [רש״י, רד״ק, אברבנאל].
This absolute loss of boundaries leads to a devastating outcome of endless bloodshed. The most widely accepted understanding is that murders became so frequent that the blood of one victim literally pooled into the blood of the next, serving also as a metaphor for the compounding nature of their sins [רש״י, רד״ק]. A uniquely tragic interpretation bridges the sexual immorality with the rampant violence. Because of the widespread adultery, family lineages became entirely confused. Consequently, a person could end up striking and killing his own father or brother without ever realizing they were family. In this tragic reality, the blood a person spills is actually his very own [אברבנאל].