The problem, you see, is that there are (appparently) several Guests who are signing themselves "Guest". Every one of them then appears on the forum as "GUEST, Guest". They are thus indistinguishable from one another. People assume that they are all the same person.

This is kind of like several different people wearing identical gorilla suits and crashing various social occasions incognito and all getting blamed for whatever any of them ever does!

Damn silly, isn't it? ;-)

I see no possible remedy for this situation except if the "Guests" stop all posting under the same label...and how would we ever know if that happened?

We wouldn't.

Let's try, instead, to build a better mousetrap or discover what happened to Judge Crater. There would be some chance of success.