First of all, you seem to link the importance of a given organization with its contribution to the fall of the CCCP. The fall was THAT important to you?
Secondly, it seems as though our very own CIA disagrees with your assessment; internal mismanagement, NOT the arms race, led to their demise (a view held by many, but reported by few). I haven't studied this extensively, but I found it interesting to note a differing view, one proffered by an organization such as the CIA, in the midst of Reagan's propaganda.