This should be good for a heated debate. I was still at school in '72. WTF do I know? My personal opinion, the Paras are fearsome warriors, I'd never take that away from them, but the officers and SNCOs were, in my experience, often shyte and set a very poor example, thus discipline was pretty poor ( I could give examples, but that would tar the memories of some truly outstanding paras whom I was once privileged to know.) I suspect that on the day, the Paras were not the best troops for the job, the "Troubles" were still in their infancy and in theatre training was probably pretty rudimentary too, the special role of the Parachute Regiment required determined men with a more aggressive streak than infantry units, consequently, the restraint factor in such a tense situation was weak, there was a loss of control, the NCOs and OR's got carried away and once one let fly, so did others. My take on what might have happened. We'll see.