My first attempt at posting a particular question on Stack Overflow got closed as "off topic" before any comment or answer could be posted. Although I'm a programmer and was literally trying to determine what port number to use for a server in development, the police department apparently felt the question did not "generally relate to programming or software development" and was not a "practical, answerable [question] based on actual problems that [I] face". How ironic.
Since it was a server question, I tried again at Server Fault, only to be immediately closed as "not constructive" (that is, it will "likely solicit opinion, debate, arguments, polling, or extended discussion"). I guess we'll never know if my question would have spiraled into generating that kind of horrible calamity.
I crossed my fingers and gave it one more shot at Super User. Immediately the police department began hovering over the question, threatening to skewer me once again (don't those people have better things to do?). Fortunately, an answer angel swooped in, and posted exactly the kind of informed response I was looking for. (He was also nice enough to post his answer as a comment on the two previously closed versions of my question.) So, in spite of the police and their attempts at squashing my question, a valuable (at least to me) question-answer exchange was finally able to take place.
Was the police department too eager? (Here I am policing the police!) Shouldn't a question be given a bit more time and a chance to prove its value before being declared guilty? Would it really kill the site to allow questions to live for at least a few days, receiving downvoting and a lack of answers, or actually demonstrating the ability to generate whatever it is the police feel is a threat, before the question can be closed? Isn't it premature to close a question to avoid "opinion, debate, arguments, polling, or extended discussion" if a single response hasn't even been posted yet? (I know those questions have been asked before, but bear with me...)
In my case, I made the mistake of using words like "best", not realizing how subjective questions are considered so distasteful to the police. In trying to fend off the police, I pleaded for them to consider a statistically likely answer, and lo and behold the answer posted by the angel was indeed determined by a poll.
Bottom line: my experience above seems to me to be proof that apparently subjective questions can sometimes ultimately be answered rather definitively, but the site's current closing policies don't allow for that, hence those policies appear flawed.
(Yes, I'm expecting extensive downvoting on this post.)