Why do we see so much of it in books, movies, TV-shows, etc.?
I sometimes get the feeling that the ones having the last word (a.k.a. the decision makers) think their customers simply
don't get it, means they seem to convince the writers to explain everything; after a while this behavior becomes a reflex. I stumbled over things like the one described in a lot of newer books and movies, it seems to be a trend, unfortunately.
IMHO: I actually get angry when I get the feeling that a pun or a joke needs to be explained because I (supposedly) don't get it. It tells me that the book or movie in question is not meant for me.

