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Survival makes animals out of men.
The starving Jews in the cattle cars nearly kill each other when they compete over the bread. The Rabbi's son notices his Dad lagging behind the evactuation march, but because he feel his dad is merely decreasing his chance of survival, he dismisses his dad as dead weight. When Elie's dad dies Elie feels relief that the burden of his father is finally over. All of these examples reflect the extremes man will go to survive in times of great suffering, and men return to their basic primal instincts.
