Why are threads here arbitrarily closed?

It’s about thread, which was closed completely arbitrarily by Johnes. He writes on my question why a previous thread was closed arbitrarily, lapidar quote: 1. Could you have sent me a letter directly! 2. Are closed posts not reopened. 3. Is the question in this forum area also not correctly placed. to 1.: Why should I personally clarify things that someone not as an individual, but as a “public functionary” (moderator of the foreman) ums) has decided? to 2.: No one has ever asked for this, how does it come to that? to 3.: Is that a sufficient reason to close a thread? Aren’t wrongly placed threads usually moved? I can only shake my head about so much arbitrary and power.