Why were nearly all comments criticizing the title of the top post in the subreddit removed?
The post title “arbeit macht frei” or “work sets you free” was the slogan used at the entrances to concentration camps. Minimizing the Holocaust through analogy is considered a form of Holocaust denial by, for example, the Auschwitz-Birkenau museum. It's one thing to leave the post and resulting critical discussion up, but only the discussion was removed.