Just as a most recent example (I could give many more posted by other users too), this "answer" does not answer the question, brings up confused rhetoric intended to troll about fundamental physics generally, and the only logical interpretation of the link in this "answer" is that it is meant to troll about string theory, which is not even the topic of the question. This user states in his profile, that he is a "aether wave theorist" which clearly says that he has his own by mainstream physicists not accepted personal nonsense theory, which he advertises indeed here on Physics SE as one can see when looking at his other "not a real answers" he posts to fundamental physics questions. From physics blogs, such as Prof Strassler, Resonaances, Cosmic Variance, Philip Gibbs, etc as well as from his comments below popular news articles about fundamental physics, this particular user is well known for his trolling and flaming to interrupt serious physics discussions and for his attack against mainstream physicists and their work as well as promoting his personal fringe theories.
There are other examples of questions, where people abuse the answer feature in the same way, as can for example be seen by looking at the answers with negative score of this question where the "answer" of a user who calls himself Albert Z, another troll well known in the physics blogosphere, is even upvoted!
When I flag such posts, because they do not answer the question, are trolling about accepted mainstream physics and/or advertize personal nonsense theories, or because the particular user posts such things repeatedly at different questions too, my flags are often decline by a moderator who says " A moderator has looked at it but there is no evidence " or something along these lines.
As the corresponding flags are declined, what else can I do to indicate that there is a problem with these posts and maybe even with a particular user who posts such "not a real answers" to different question about particular topics on the site?
Declining these flags and denying that there is a problem with these posts/user gives the (I really hope wrong!) impression that Physics SE tolerates and even protects (!) such a behavior. This impression is reinforced by noting that we have a not negligible number of people who even upvote such posts...
I always thought that Physics SE is for doing physics seriously, and that in contrast to some blogs, forums, discussions below popular news articles, etc where it is ok for people to rather state their personal wrong/bad informed opinions, attack mainstream physics, advertize personal fringe theories, to troll and flame, etc should be kept out from Physics SE such that people seriously interested in learning about all (!) topics of physics can do so undisturbed by such negative, nonconstructive, and disruptive behavior.
What am I getting wrong here? Is Physics SE really tolerating this bad behavior?
There are trolling questions too sometimes, but they can be flagged as not constructive, not a real question, offensive if they are really bad etc, but equivalent flagging options to point out such inappropriate behaviour in answers are missing...