Why didn't Shmuel think his father went on a march?
At this point in the narrative, Shmuel is becoming a bit distressed at his condition in Auschwitz. It is progressing more than just disliking the place. The fact that Schmuel does not believe the explanation that his father is on a march. At the same time, Shmuel does not seem to be accepting of what Bruno says in terms of there being a "simple" explanation. This is reflective of the deteriorating condition that Shmuel is experiencing in the camps. Shmuel is looking “even more unhappy than usual" and there is a note of bitterness in his speaking to Bruno. When Bruno suggests that he speak to his father, Shmuel indicates that the soldiers hate the people on the other side of the fence. Interestingly enough, Shmuel also makes clear that he hates them. It is this insight that enables one to see how Shmuel does not accept that his father went on a march. Shmuel is not accepting of any "simple" solutions that express optimism. Instead, he is becoming more dour regarding his situation. Shmuel does not think his father went on a march because his condition is worsening. He understand that in such a predicament, more dire conclusions are going to be present than optimistic ones.