Thanks,for later.
For whatever reason, the elected leader of Ireland wanted the country to be neutral, and in order to be taken seriously by Germany, they had to put some penalties into this. One could make an argument (not necessarily my argument) that if they “pardoned” these people now, how could the Irish government be taken seriously as neutral in any future war. Again, these are not necessarily my opinions so don’t beat me up.
Keep in mind that US (one, I think) and British soldiers were actually kept “prisoners” in an IRISH(!) POW camp during the war, some from planes that crashed or made emergency landings in Ireland. I don’t think they were treated badly, and the POW camp was pretty posh by “prison” standards. Although there was virtually no security, I think both governments basically assigned these soldiers there and they were told not to make any attempt to escape!