The two ages of war could provide a means of sketching out a paradoxical law that is both similar to and different from Bergson's "double frenzy." On one hand, we would have the escalation to extremes, and on the other a return to origins, a "tracing back" of history as [Charles] Peguy said, towards what you call the founding murder. The two movements would be linked: the closer we get to the end, the further back we go. The more history tends towards the worst, the less we will be able to hide the need for a clear discussion of archaic religion.
I've often thought that history is moving backward. I'd guess we're now somewhere in the late 4th / early 5th century AD.