As the "someone" who referred to "disturbing" hikers in shelters, let's set the context: I never even hinted that they'd deliberately a la Hells Angels harass or disturb hikers. Nor did I aver that it's "my" trail and they had no right to it. Of course they do; as you said, they're just "fast hikers." Fine - nothing wrong per se.
These folks are running all night including when hikers are likely sleeping. It's just inevitable that when a group even as small as 5 happens upon a shelter at 1 AM, they will disrupt the scene however unintentionally unless they make an effort to keep quiet. Have they thought of this?