At least, imo, the knowhow doesn’t have to be 100 %; if most people “behave properly” most of the time, all is fine. And I hope that e.g. Peter Leinchen in the mentioned post just shrugs the flag away as “unexplicable” (it certainly is for me).
Maybe because I’m unable to see the “suppressed” part as strongly as you – I explicitly clicked the link with the hidden/flagged contents (and paid more attention than were it non-flagged) – I don’t take much offense of a (small) couple of false or doubtfully flagged posts.