Just from my perspective:
When a single person reports a post, it is often (I said often, not always so relax) because someone is overly sensitive and has been triggered, or has a personality conflict(s) with someone else.
If multiple people report the same post (yes, this does happen relatively frequently) then usually it's pretty clearly out of line.
Why don't we have a sub-forum called, "Dumpster Fire," and cut-paste all the garbage there?
"Sapiens dicit: 'Ignoscere divinum est, sed noli pretium plenum pro pizza sero allata solvere.'" - Michelangelo
Here's the problem with that: even though it would be clearly spelled out that this was the place for shitposting and memes - and to stay away if you are easily triggered - people would still go in there and report post because they were triggered.
It's like when people declare "I have you on ignore!"
Um...