Would examining stupidity as a concept provide some insight? What better resource could we ask for than the very one that prompted this exploration in the first place – the dictionary.

Here’s the definition according to Webster’s – Stupidity:
1 : the quality or state of being stupid
2 : a stupid idea or act

Not very informative is it. Here we have a subject with more words related to it than any other, yet the only definitions of the word itself merely refer to its root form as if it has no tangible meaning at all. I won’t bother referencing the root form “Stupid” since its definition is no more enlightening.
Search through the endless wealth of knowledge recorded throughout the history of mankind and you will find that definitive reference material pertaining to our subject is virtually non-existent. We are thus left completely on our own to continue the quest for answers. From here on we must rely exclusively on our skills of creative and critical thinking to blaze new paths of exploration and then employ decisive deductive reasoning to further our search of a final resolution.