The passage that I refered to, in the context of the last panel on page 227 in Maus is as follows:
....the latrines themselves were usually nothing but a trench with logs on either side on which prisoners had to balance. Any public elimination was extremely degrading to Germans, because in Germany utter privacy when eliminating was the absolute rule, except for infants and small children .... Therefore, enforced observation of and by others was a demoralising experience.I highly recommend the book as an indispensible analysis of not merely the details of the Nazi concetration camps, but of the psychology of the administrators, the guards and the prisoners: issue such as individualism, the fate of the hero, rationalisation of attitudes in both directions (e.g. helpless prisoners to all-powerful guards, and German guards to Jewish prisoners.) It is also a sustained argument against moral equivalancy: the extreme brutality and inhumanity of the Nazis a thesis.