Final answer:
The couple in "The Monkey's Paw" uses the second wish to bring back their son out of profound grief, despite the dreadful outcome of the first wish, as their longing for reunion blinds them to the potential dangers.
Step-by-step explanation:
In the story "The Monkey's Paw," the couple reluctantly decides to use the second wish to bring back their son, mainly because of their profound grief and desperate longing to see him again. Despite the ominous and dreadful outcome of the first wish, their emotional suffering overrides their judgment. They are blinded by the possibility of reunion with their son, which makes them overlook the uncanny and potentially dangerous consequences of manipulating fate. The experience with the first wish was terrible, but their love and grief-stricken minds compel them to risk another engagement with the supernatural in hopes of undoing the tragedy that has befallen them.