So thanks for your reply, but it's along totally different lines from what I had in mind. (I added an Edit on the bottom.) What I mean is more along the lines of the 'new world order' conspiracy I linked. Why wouldn't we want something like that? It would save all of the costs of the same colluding powers hacking each other. In this specific example, why wouldn't we want China and the U.S. colluding rather than hacking each other? But this collusion is kind of the definition of a "new world order". Why wouldn't we want all the countries in on it?

You are certainly right that my impressions are quite shallow, I am mostly proceeding from first principles, a few use cases, ideas, and philosophy. Thanks for your thoughts.