In "The Monkey's Paw," the monkey paw always grants what a person asks for, so why do people still fear and hate it?W. W. Jacob's "The Monkey's Paw"

When the sergeant major arrives at the Whites in the
exposition of "The Monkey's Paw," he tells them that three men can own the monkey's
paw.  The first man had two wishes granted; however, his last wish was for death.  And,
when Mrs. White asks him if he had three wishes, the sergeant major replies shakily that
he did.  Evidently, there is something sinister about the monkey's paw that has had a
spell put on it by an aged fakir because the sergeant suddenly tosses the paw into the
fire.

But, Mr. White retrieves it, and the sergeant warns
him of the consequences and says,

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"...don't blame me for what happens.  Pitch it on
the fire like a sensible
man."

Despite the warning of
the soldier and his fear of the paw, the Whites go ahead and make a wish.  But, when Mr.
White does make his wish for two hundred pounds, he does not stipulate how the money
will be procured; and, as things turn out, the money arrives, but it is an insurance
payment on the life of Herbert White, the so, who was killed in an accident at work. 
Distraught and heart-broken at the loss of their son, Mrs. White demands that Mr. White
wish for Herbert to come back to life.  Herbert does return; however, he is mangled and
hideous, so Mr. White must use the third wish to send his son back to the
grave. 

Thus, the reader perceives that in making their
wishes, the Whites are not cautious and they fail to consider the consequences. In fact,
their undoings are results of their personal shortcomings, Herein lies the danger of the
monkey's paw:  it fulfills one's wish, but it does so literally without eliminating
extenuating circumstances for the one wishing.