As many of you can guess from the title, the mood of this question is frustration and desperation.
As a background, my question on why Nazgûl did not kill other hobbits on Weathertop is marked duplicate with another question asking why Nazgûl did not attack a second time on Weathertop. While the answers to both question includes the fact that Nazgûl were afraid of the barrow-blades and were reluctant to engage any further than necessary, they are clearly different questions. My question completely disregarded Frodo and the ring and focused on why Nazgûl did not bother to kill other hobbits. However, the duplicate question focuses on why Nazgûl did not attack a second time to get the Ring directly from Frodo.
Note that while the fear of barrow-blades constitute the main part of both answers, some additional information unrelated to other question may be included in the answers as well.
The duplication policy has been discussed extensively. This is a discussion I myself started on this issue. The consensus was that answers themselves do not make questions duplicate; they can only be used as a litmus test.
Even though I linked the above meta post and stated once again that answers do not make questions duplicate, two more people VTCed, showing that they deliberately VTCed in spite of the previous discussions on Meta.
From my point of view, closing a question as duplicate simply because it resembles another one is not helpful to the discussion. Had it been closed before, I would not have the chance to read the excellent answer Shamshiel provided.
Finally, the question is, why do some users with quite high reputation deliberately misuse their VTC privilege?
Addition: My comment under the question where I link the meta post is removed.