Give me one logical reason...
I'm glad you ask. Maybe we will not agree, but at least you do not assume anybody who is not your oppinion is plain stupid.
Did I already state that I think I see your point? Your of course right about the definitions of the headlines.
One logical reason.

But you know that "logical" only means "coherant" or "without contradiction in itself".
And so it is logically correct to say: A lot of people use the word "**********" falsly. Langauge is not pure logic, it's logic IN tradition. And you have to admit at least, that the thread title is held explicitly general, "(fantasies, stories, pics, methods, etc.)".
But I stated that already.

I'd like to give you another logical point, hope you find it convincing:
Back in 2002 there simply WAS no thread called penectomy. Penectomy was not started until 2008, six years later!
So if "casual misuse" of the ********** thread happenes it is not illogical to tolerate it out of traditional reasons again, it's more like a sign of good manners, I would think. (No offence .)

And finally I want to give you my "best" logical reason, which is to be debated about but it's just what I think:
There already have been disussions about what belongs where all the time not only in this forum. If your strict logic was all there was to say, the we BOTH would not belong here, because this is a ballbusting forum!
Can't you read?
So where does who belong? Is it realy sensible that every nuance of any given pervert interest should go have it's own forum with its own threads and so on? What is about the social character of a forum? Is it forbidden that two groups with overlaping interest post and talk together? Is it more a problem or more an enrichment? And if you insist on "Problem": Down to what extend would you split groups up? Locically there is no limit until every person sits alone in on very, very special forum...
That cannot be the sense of it all. And it isn't, look: If you imagine to see a woman standing right in front of you, naked, gorgeous, knife in hand! In that moment you feel the same as anybody here: Youre hot. So should I post those picture into the penectomy thread because when I made it I had a penectomy in mind and not a "**********"?
...?

So ok, the last point is complex. I think it's logical but it depends on other opinions so you may debate.
But think about how much we all have in common and what the point should be only talking to people of exactly the same interst as yours and think about, how it came that we are still talking together in this "methusalem"-thread for nearly ten years now, then I freely admit, that youre point is also logically right.
But please! Let's take it with a little good will, humour if you like, with "a grain of salt"; this is not an official-government-**********-advice-site.