I've not the time for a long debate on the rights and wrongs of the GFA - suffice to say there are plenty of unpalatable decisions within the agreements, made for the greater good. I don't agree with all of them.
But, IF the evidence is there and clear, that this soldier deliberately shot...
Its inequitable, I agree.
But two wrongs don't make a right, and I think we can justifiably expect our servicemen to be held to a higher standard of behaviour than a gang of rabid paramilitary criminals.
All fair points, and all factors that you would absolutely expect to be considered as evidence / mitigation in any due process. They don't preclude the process taking place though.