To return to the convoy about to depart. There was neither time nor desire to consider moral or ethical issues. Every man was controlled by one thought only: to keep himself alive for the family waiting for him at home, and to save his friends.

[…] On the average, only those prisoners could keep alive who, after years of trekking from camp to camp, had lost all scruples in their fight for existence; they were prepared to use every means, honest and otherwise, even brutal force, theft, and betrayal of their friends, in order to save themselves. We who have come back, by the aid of many lucky chances or miracles—whatever one may choose to call them—we know: the best of us did not return.

— Viktor E. Frankl, Man’s Search for Meaning, 1946, Beacon Press (2006 edition), p. 14