Alternate plot based on similar concept:

Mr Garrison goes back to being Trump for some absurd reason, and then Stan and Kyle make a comic mocking him, Cartman basically becomes Steve Bannon/Alex Jones and leads an insane campaign against Stan and Kyle for making the comic, and …

…now there is a whole conspiracy, invented by Cartman, about horrific secret encoded messages in a supposed secret vault or collection of all the student’s doodles and comics and passed paper notes…

… and after not too long, Cartman stops talking about Mr Garrison being any kind of related to this supposed ‘naughty vault’, focuses instead on an insipid profundity of CSAM kept from the public…

… and then it turns out (revealed to the audience but not any characters beyond Garrison) that there is actually a ‘naughty vault’ of confiscated student messages and drawings and such (nothing beyond schoolyard insults from tem), but the only detailed, explicit CSAM is from Mr. Garrison himself, who has beem uh, doodling his own comics, and keeping all this in a vault in the school office somewhere that only him and the janitor have access to…

… janitor dies in a suspicious manner, Mr. Garrison wishes his wife well, janitor wife ends up being convicted of producing CSAM doodles, Cartman is now screaming for the entire ‘naughty vault’ to be released, Kyle and Stan think this is all I mean, yeah, bad, but Cartman is kinda going off the rails

Part (Episode) Two:

Summer break montage, which involves a bunch of rednecks breaking into a random pizza joint, trying to assasinate Garrison, and also then breaking into the school and largely destroying it… one or two of them are looking for the naughty vault, but mostly they’re just angry for nonsense reasons, such as ‘they took erh jerbs!’…

… somehow, Cartman becomes some kind of official school liason/resource officer/investigator, who is now formally/informally leading an outright pogrom, sentencing any students he thinks may have their works in the naughty vault to onerous amounts of after school detention, including Kyle and Stan.

Kyle and Stan are beyond fed up at this point, as Cartman has ‘assigned’ them to make a formal apology video for their involvement in the naughty files, so they just do the thing, make the callback reference to ‘we’re sorry’ in the most sarcastic and insincere way possible…

… but basically half the town thinks its real.

Then, uh, somehow, Cartman gets Garrison’s key to the naughty vault, and finds copious amounts of CSAM that is obviously drawn by Mr Garrison, while Mr Garrison is busy for the weekend judging a school beauty paegent.

Cartman has a mental breakdown, jams the contents of the naughty vault into a … trapper keeper… then b-lines to the beauty paegant to confront Mr Garrison in real time.

During some kind of lunch break or something, the confrontstion occurs between Garrison and Cartman.

Garrison points out thar Cartman’s own doodles and horrid missives are in the naughty vault, Cartman and Garrison begin brawling over all the documents, the fight stumbles into the girls changing room, the trapper keeper is ripped in half, documents comically go flying everywhere, Cartman is dazed, Garrison laughs maniacally and says he wrote all his stuff on flash paper thst easily combusts.

As the girls are now all scrambling to get dressed and flee, while Garrison pulls out a lighter and tries to burn everything that he can, but this literally blows up in his face, Garrison runs out of the girls changing room, past a bunch of crying half dressed girls, with his hair (toupee) literally on fire, hands red from his own blood from injuries sustained fighting Cartman, all infront of the paegant attendees returning from the lunch break, and a local media crew with camers rolling, getting b roll footage / interviews.

-end scene, roll credits-