The victims of PTSD often feel morally tainted by their experiences, unable to recover confidence in their own goodness, trapped in a sort of spiritual solitary confinement, looking back at the rest of the world from beyond the barrier of what happened. They find themselves unable to communicate their condition to those who remained at home, resenting civilians for their blind innocence.The Moral Injury, New York Times. Feb 17, 2015
Knight, of course, felt that anyone's willing assistance tainted the whole thing. Either you are hidden or you're not, no middle ground. He wished to be unconditionally alone, exiled to an island of his own creation, an uncontacted tribe of one.