This is done to threaten and silence any remaining people that have seen the truth with their own eyes, and know first hand holocaust is a lie. Clerical staff, assistants, etc weren't killed on the spot or charged in Nuremberg „trials”, because: a) they were civilians and torturing scores of additional people to obtain false confessions was unnecessary complication of that show b) the holohoax narrative and fanfiction became a huge thing some 20 years after the end of WWII as it really started to serve as a extortion racket and a funding myth of postmodern political order. Old people who are still mentally and intellectually apt and know they don't have much time left, often stop fearing consequences of what they say. If I was a betting man, I'd wager that all of those who have actually seen the labor camps from the German perspective and were allowed to live after the war ended, are invigilated by ZOG alphabet boys and any attempt to speak the truth (eg. contacting a publisher) gets them a sentence and prison time.