1). The motif is the loss of care among prisoners.
2). Being constantly exposed to these actions leads to the loss of care among the prisoners.
3). When Wiesel says "What had happened to me?.. Had I changed that much? So fast?" These are examples of rhetorical questions.
4). This use of the rhetorical question helps us fully understand how Elie is deterring mentally. He says that the previous day he would have mauled another prisoner had they done that to his Father, but today he has changed from that motivation because of all the horrific actions that he sees every single day, he's so used to it that it doesn't even affect him anymore.