In A Farewell to Arms, according to Passini in Chapter 9 and the priest in chapter 11, why do wars countinue? How are their views different?

Passini and the priest both abhor the war, and they both
allude to a ruling class that makes war and to the officers that support it. Their
opinions differ, however, in regard to why wars continue. According to Passini, "There
is no finish to a war" because wars are not won through military
action:

War is
not won by victory. What if we take San Gabriele? What if we take the Carso and
Monfalcone and Triests? Where are we then? Did you see all the far mountains today? . .
. Only if the Austrians stop fighting. One side must stop
fighting.

Passini believes
war will continue because the controlling class "is stupid and does not realize anything
and never can."

The priest, in contrast, believes war
continues because those who oppose it have no political power and are forced to wage war
by those who do:

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They [those who oppose war] are not organized to
stop things and when they get organized their leaders sell them
out.

The priest, however,
unlike Passini, has not given up all hope that the war will
end:

It is
never hopeless. But sometimes I cannot hope. I try always to hope but sometimes I
cannot.

Passini and the
priest both see the war as a terribly destructive force created and continued through
the human failings of those with power.