I HAVE THESE TO SAY:

The real problem is not if the users you mentioned above are quality posters or not. The problem lies on whether it is right to leave a tag to anyone whom you feel made one or two low quality posts among 100 good ones he made.

Another issue for determination is whether what JollyGood left is actually a tag?
Personally, that is not a tag. First the writeup said "Note for Self" which  means there is a need for the forum to provide a means for users to take note or a user need to take note with a bookmark.
Secondly, it is a natural note(tag).
Now, the question is, is it right for a user to take a note on someone's trust feedback?

A big contradiction in the side of JollyGood is deleting the evidence of tagging someone and still pointed reference to a deleted evidence without archiving it.

I understand that JollyGood is running a self moderated thread in the gambling discussion board. In that board what appears to be a quality post could be totally off point to complete signature quota. Only sports men will understand what I mean.