How does Remarque use Paul's experiences in all All Quiet on the Western Front to emphasize the futility of war in chapters 6 and 7?

In Chapter 7 of All Quiet on the Western
Front, Paul narrates,

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We want to live at any price; so we cannot burden
ourselves with feelings which . . . would be out of place
here.

From their experiences
of the grotesqueness of the effects of mustard gas, the savage brutality and the madness
and despair of trench warfare, Paul and the other soldiers become benumbed and
dehumanized.Remarque writes in Chapter 6,

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After this affair the sticky, close atmosphere
works more than ever on our nerves.  We sit as if in our graves waiting only to be
closed in.

Night again.  We are deadened by the strain--a
deadly tension that scrapes along one's spine like a gapped knife.  Our legs refuse to
move, our hands tremble, our bodies are a thin skin stretched painfully over repressed
madness, over an almost irresistible, bursting roar.  We have neither flesh nor muscles
any longer, we dare not look at one aother for fear of some miscalculable thing.  So we
shut our teeth--it will end--it will end--perhaps we will come
through.

To further describe
the men's condition, Remarque writes in an impressionistic
style,

The
brown earth, the torn, blasted earth, with a greasy shine under the sun's rays, the
earth is the background of this reslesss, gloomy world of automatons, our gasping is the
scratching of a quill, our lips are dry, our heads are debauched with stupor--thus we
stagger forward, and into our pierced and shattered souls bores the torturing image of
the brown earth with the greasy sun and the convulsed and dead
soldiers.

It is this
"automaton" who returns home on leave in Chapter 7.  However, Paul finds that he is
irritated with questions about his being at the front.  When his father asks him to wear
his uniform, Paul refuses.  When his old schoolmaster and others talk with him at a
cafe, Paul is irritated by their talk of what they do not
know.

Paul's return home is not what he has imagined.  The
men have talked too much for him, he prefers to be alone, so that no one troubles him. 
Like a Hemingway character, Paul wants "just to sit quietly."  Others understand, but
they feel it only with words.

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They fell it, but always with only half of
themselves, the rest of their being is taken up with other things, they are so divided
in themselves that none feels it with his whole essence; I cannot even say myself
exactly what I mean.

Paul is
disillusioned with the nothingness of some people's lives.  He observes their
occupations and wonders how such a narrow activity fill their lives.  He goes to his
room where he looks at his drawings and postcards that have pleased him.  He looks at
his books.  Instead of the "quiet rapture" which he once felt with his books, Paul now
feels only emptiness.