What do you think this poem might be saying about human nature?

In the Desert by Stephen Crane:
In the desert
I saw a creature, naked, bestial,
Who, squatting upon the ground,
Held his heart in his hands,
And ate of it.
I said: “Is it good, friend?”
“It is bitter – bitter,” he answered;
“But I like it
Because it is bitter,
And because it is my heart.”

ate and sandwich?

explanation:

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“asleep in his bed” is personified.