Command to fire on tape?

Now here is another one I have a problem with. What happened was wrong. Someone made a mistake but really after all this time can you honestly trust any new evidence? I am not saying anyone faked anything. I am just saying that it is hard to believe it has been this long and this is just now coming to light. Let’s say it is true for a moment. Ok, does that bring anyone of those people back? No. Does that alleviate the guilt that every single Guardsman felt and probably still feels? No. So why after all this time? I simply don’t understand. What happened was bad, no doubt about it, but why start this all back up again?