Probably just for the joke.
South Park
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Cartman already saved the post pandemic world. How much redemption does one need?
No. It'd too far gone at this point. I genuinely thought during the introduction of PC principle/his relationship with Hiedi was actually going to be some growth for him, but like if he is going to relaps back into it even after things went thar well for him then there is 0 hope for Cartman. He will never be redeemed, because in his mind there is no need for redemption.
Nah that would be like Chef turning out to be a pedophile 😶
Cartman getting a redemption arc would be like the gang from always sunny getting a redemption arc.
In other words, impossible.