Ah the same guy who testified against the nazi's after the war at nuremburg, aided the alies, took part in numerous documentaries over the years and whilst there was so disgusted he requested transferring anywhere else (including the front and certain death)
This was a man who joined his national army after being caught up in the propaganda not realising the full horror of what they were, joined what the propaganda considered the elite branch of the military. Then when placed at this death camp and learning the full horror of what his country was doing he requested an out, to go even to his own death and refused. He then completed his job for the short time left of the war (1944 he was sent there iirc)
this was a glorified admin assistant at a Auschwitz and up until this trial he was considered a source, a witness someone to go to for accounts from the german military side, someone so far down on the totem pole of people who deserved punishment he was rightfully ignored.
Now that all those who could be prosecuted who really should be brought to justice have been or died they are scraping the barrel seeking vengeance on anyone - this is vengeance now not justice, this man sought to atone for his 'sins' (of bearing witness and being in the army) and up to now it seemed everyone considered he had.