As a soldier, especially at that time, it must have been a very difficult situation to find yourself in. The local population, or at least the people you saw on a regular basis, hated you with a passion, which they were at pains to make obvious everyday.
Then you're told repeatedly how dangerous these people are, before confronting what amounts to an angry mob. Yes, the demonstration may have been peaceful, but even peaceful demonstrations can be intimidating to those tasked to police them when they're significantly outnumbered.
Unless you've been there, it's very difficult to understand just how intimidating, and frightening, it can be.
Should the soldiers have opened fire if they weren't in imminent danger? No, of course not. Should individual soldiers be prosecuted after all this time? Personally I don't think so.
As others have had to accept the release of convicted terrorists under the Good Friday agreement, would it be wrong to expect the people of Derry to accept the vindication of their account of that day without pressing for prosecution of individual soldiers?
I guess we'll find out soon enough...