from the first chapter, “Parole, Parole, Parole,” of Tobias Jones’s The Dark Heart of Italy (2003):
As I began studying postwar Italian history, it became obvious that surrounding any crime or political event, there are always confusion, suspicion, and “the bacillus of secrecy.” So much so that dietrologia has become a sort of national pastime. It means literally “behindology,” or the attempt to trump even the most fanciful and contorted conspiracy theory. Dietrologia is the “critical analysis of events in an effort to detect, behind the apparent causes, true and hidden designs.” La Stampa has called it “the science of imagination, the culture of suspicion, the philosophy of mistrust, the technique of the double, triple, quadruple hypothesis.” It’s an indispensable sport for a society in which appearance very rarely begets reality. Stendhal wrote about it in The Character-house of Parma: “Italian hearts are much more tormented than ours by the suspicions and the wild ideas which a burning imagination presents to them.”
Consider, as counterpoint, Moravia’s short story “Non approfondire” (Don’t delve too deeply). Compare, of course, the “hermeneutics of suspicion.”
There is an interesting discussion of the word at the Language Log, and it’s the subject of a column in the Economist from 2011.