Question

What are possible reasons for Tobias Wolff naming his morality play “Mortals”?

All the characters were mortals facing dilemmas that only mortals face.
Sooner or later, all “mortals” question how they will be remembered after they face immortality.
To be mortal means to face death and to embrace the inevitably of it in nature.
The characters longed to be immortal but were plagued with mortality.