Insanity and biblical wisdom/poetry authorship

I've recently begun to internalize the scholarly consensus about the authorship of books such as Psalms, Proverbs, and Ecclesiastes. The basic idea is that later composers (or even the culture at large) would attribute their work to an author to lend credence to their work and to honor them as the paragon of their tradition. For instance, David was seen as the greatest of YHWH's worshippers. Solomon was seen as the wisest at the head of a wisdom tradition. Doubtless, David wrote some psalms, and Solomon wrote many proverbs. But it's problematic to insist that every header in the Psalms that says "Of David" means that he sat down and composed it. (Never mind the fact that the preposition may not mean David wrote it, but it may mean that the psalm was composed "for David" or in his honor.)

Where does insanity come in? You've probably heard Albert Einstein's famous definition: "Insanity is doing the same thing over and over again and expecting different results." Problem is, the first place scholars can locate something like this sentence is in a Narcotics Anonymous handout from 1981. (See this site.) Why bring Einstein into this? He was a very, very smart man. He lends credence to my saying the aphorism. And nobody really wants to refer to NA in conversation.

This current example illustrates very well how biblical literature could have been attributed to famous people from the past. It just seems like the right thing to do.