The monster famously so scary that the army was brought in to fight it? That could be considered the origin of the idea of the "800-lbs Gorilla in the room"? Yeah, pretty sure he does get what he wants.
Tell that to Frankenstein.
Doctor Frankenstein was a pathetic man. His creation was uglier than sin, but well-spoken and articulate. So, you are likely refering to the movie version of "ugggggh" practically a zombie Frankenstien's monster... which is still plenty terrifying. Could easily clear a room.
Tell that to any low-Charisma threat.
Dangerous nuance gains noncooperation.
So, since you named two famous horror monsters, maybe you need to re-evaluate your terms? What you seem to be getting at is that non-verbal entities can't articulate what they want, and therefore won't get it. But that doesn't address the point ANYONE else is making.
Let's try again with another low charisma example. Heck, we'll give low intelligence too. Hill Giant comes to a farm, sees two farmhands. It says "Give Cow". Now, maybe you decide that the Hill Giant is just a Dangerous Nuisance and the farmhands don't cooperate. So he smashes one of them into a bloody smear and says "Give Cow!"
That other famrhand is intimidated. They are scared witless. They probably were scared witless BEFORE their friend was killed. This is just how people would react to that threat. There would be cooperation here, because it turns out that people want to live.
Now, maybe you want to say that there would be non-cooperation. Those farms and villages wouldn't suffer under that Giant's hunger forever, some scrappy young hero would rise up and deal with the threat. Well, the same thing was true of Strahd, and turns out he has a really high charisma, so if that is non-cooperation, then EVERY monster is just a "Dangerous Nuisance" and not a real threat.