The Good Friday Agreement does not give immunity to HM Forces, only terrorists
I know it's only Wikipedia, but if I am wrong, someone with more of a legal brain let me know:
Both the British and Irish governments committed to the early release of prisoners serving sentences in connection with the activities of paramilitary groups, provided that those groups continued to maintain "a complete and unequivocal ceasefire". Cases were reviewed individually.[10] There was no amnesty for crimes which had not been prosecuted.
Our legal system is not free of political bias, the decision or not to prosecute anyone in cases like this is at the whim of Sinn Fein and our 'Government' desperate to throw soldiers to the wolves for political expediency.
Only the naive amongst us would sit comfortably and say this is a good, free and just decision.