ooooh boy
guilty too...sure I'll tone it down.
You are using a very broad brush painting folks as trolls is a harsh one though.
hell half a post I write may be on topic and answering a question or solution to a prob, and the other half larking around...
hell everyone has gone off topic somewhere sometime...
no one is lily white and faultless if we are speaking of staying on topic...

The issue of finding relevant information in the forum here has ALWAYS been a challenge to sift through threads and posts of conversation,
that has been this place from day one.
Don't take my word for it, do searches pertaining to any topic here as far back as the beginning of this place, you will find topical posts, quasi topical posts and barely-hanging-by-a-thread posts, and straying off topic posts...
Dating back all the way to 2005...
Long before I or most of the current members have been here.

Actually if one does a search,
One of the first things I did when joining here was try to find a SOLUTION to this dilemma, not just call folks out and paint them as trolls.
I attempted to implement a method of being able to accurately sift at a click and find what query was being searched for.
Not an easy thing to do,
hell... I still am working on the project, though it seems dormant in the "garage" here.

I don't think what is wished for here is moderation from a moderator though,
I think what is desired here is absolute control over what people write, how they write it, the exact percentage of content and whether or not it meets a specific standard of specific approval....by specific people.

Here ...over time ..
I have seen the Grammar Police,
the Syntax Police,
the Post-to-long-didn't-read Police,
and now Content Police.

So ...if a post is not even close to the topic sure...you are right.

But
If a post is humour based on topic ...what then?

if a post has exact information in it that is pertinent and important...and as well has superfluous, reminiscences, or humourous content in it...what then?

If a post is:
asking a question, repeatedly even (if no one responds) ,
a new or old member asks questions that have already been answered elsewhere,
agreeing with another,
or disagreeing,
is that considered "content"?
Or is the above considered "fill"? taking up useless space and detracting from the ability to find relevant information?

If a post has bona fide complaint and concern in it, wish to inform others of said concern, to inform and warn, but it offends the agenda of some...(such as Dave's past issues and concerns for example) ...what then? does that paint them as troll? Some have done so. And I believe that that is SO offensive as to be considered morally repugnant.

So...
Where is the "cut-off"?
Since all are guilty here
What is the desired exact content percentage in a post?
Please specify the Draconian rules one wishes to insist on.