I am once again encouraging people to use /c/shitreactionariessay on grad. Also, spicy hot poorly concocted take incoming. (This is not directed at OP but more people who hate Rule 8)
The reason rule 8 exists kind of bears itself out to me in shitreactionariessay: no harsh to whoever runs it, but the comm is just a deluge of crap. It's a race to the bottom for whoever can dredge the dumbest and most incoherent takes riddled with slurs on the Steam forums or whatever garbage hole.
Now sure, if Rule 8 didn't exist and thedunktank had this type of thing users could just block the comm, but: what if we just don't have a firehose of garbage as a comm? The dunks are more fun when someone has a quasi-coherent position to dunk into the sun, the dunks are more fun and considered when you can take apart their brainworms instead of just another g*mer yapping or whatever. Low hanging fruit by nobodies on reddit or other places does not make for stimulating posts or replies.
To be very fair, I don't see a lot of utter garbage get removed under Rule 8, this is not to accuse anybody of poor posting. I think it's probably worth it to maintain a high standard of dunk anyway though.