These essays tend to circle around the same handful of arguments. An especially prominent theme, most frequently associated with Martha Nussbaum's defence of the humanities, is that literature is good for us because it promotes empathy, and the practice of empathy is the heart of liberal ethics and the functioning of civilised society.
Unfortunately, defending literature in this way multiplies rather than reduces philistinism. By mistaking means and ends it excludes the very heart of the matter from consideration. The joy of literature is transmuted into duty. This is in line with how professional academics understand literature - as their daily work, albeit work that they love. But if this is how the people who claim to love literature talk about it, no wonder reading is in decline.