South Park: Post COVID

In the corrected timeline created by the boys' time travel, Cartman becomes a homeless alcoholic because he pushed his mother Liane past her limit. After manipulating her into quitting her job to serve his needs and then attempting to coerce her into getting breast implants to seduce a wealthy man for money, Liane finally abandoned him. This loss of his primary enabler leaves Cartman with no support system, resulting in his grim fate as a drifter.

In the original timeline before the boys changed history, Cartman had surprisingly matured into a devoted family man who genuinely embraced Judaism, showing genuine potential for redemption. However, the new timeline created by the time travel erases this character development entirely, leaving him as a homeless alcoholic instead.

Liane abandoned Cartman after he manipulated her into quitting her job to cater to his demands, which led to them losing their home. The final straw came when Cartman tried to coerce her into getting breast implants so she could seduce a wealthy man for financial gain. This specific betrayal pushed her past the point of no return as his enabler.

The ending serves as a definitive thematic statement: Cartman could have been a good person, as proven in the original future, but he actively chooses to be terrible in the present. His homeless, isolated state is entirely earned because he refuses to take responsibility for his actions, even driving away the one person who ever tolerated him.

The boys succeed in creating a utopian future for everyone except Cartman. Stan, Kyle, and Kenny all find peace and happiness in the corrected timeline, while Cartman is the sole character left suffering, a stark contrast to their collective success.

Cartman's fate is not random misfortune but the direct consequence of his selfishness. The narrative explicitly shows that he had the capacity for love and happiness, as demonstrated in the original timeline, but his refusal to take responsibility for his actions ensures he ends up alone and homeless.

The Streaming Wars provides essential context explaining Cartman's downfall. It reveals the specific moment when Cartman manipulates Liane into quitting her job and later attempts to use her for financial gain through seduction. These events directly lead to her abandonment and his subsequent homeless fate.

The grim ending serves a purpose: it validates that even Cartman's own mother has washed her hands of him. Rather than being randomly cruel, the narrative uses his downfall to make a definitive statement about personal accountability, that Cartman's isolation is entirely his own doing despite having potential for redemption.