In his book Modern Dogma and the Rhetoric of Assent (1971), Wayne Booth argues that narratives convey a kind of knowing that cannot be falsifiable. One of the reasons for this is because art always affirms and never negates: “when dwelling in art we are affirming that life is worth living…all art finally affirms something” (177). Even the things that appear to affirm negativity upon first glance.
So, for example, did Kurt Cobain write songs that affirm life? You are tempted to say "no" because most of his songs are dark and depressing, and Cobain's fate was anything but life affirming. Even still, says Booth, a Nirvana song still exists, it still says something, an audience can listen and absorb its message. Nirvana still lives, even though Cobain does not.