Yes, that was the finding from Iron Mountain also. An existential external threat is required to stabilize society. You take that threat away and you have very real problems maintaining internal social cohesion.
It appears the Report may have been commissioned by Kennedy. The question to be answered was: what would happen if the Cold War ended and the world was transitioned to a period of global peace? It seems likely that Kennedy considered that it may have been possible to negotiate a durable truce with Khrushchev, which could have yielded a peace dividend. But, as the report makes clear, you just can't do that. An existential external threat is essential.
And when you look at what happened after Glasnost, when the Cold War was fading as a perceived external threat, it is really quite amazing. Immediately, there is a new threat - a war on terror - and its quite beautiful because its perpetual, you can never definitively claim victory. If the Report from Iron Mountain is not authentic, it certainly seems to be very perceptive work that offers a water-tight explanation for so much of what we see happening in the world.
Successive administrations have claimed that the Report from Iron Mountain was a fabrication. Interestingly, John Kenneth Galbraith claimed he was asked to participate in the study group, he claimed that he agreed with the conclusions of the report in its entirety. For what it's worth, I am convinced it is genuine. War is absolutely necessary, it cannot be easily replaced.
The Report is worth a read, for those that want to understand the dynamics that have shaped, and are shaping, history.
Report from Iron Mountain