According to Mond, why can't this future world have art and literature?

When asked why he censors old things like Shakespeare, Mustapha replies that society no longer needs them. People are happy now and would not even understand the old things. When Helmholtz argues that something like Othello is what he has always wanted to write, Mustapha says that he will never write it because tragedy and raw emotions lead to social instability. At the same time, creating works of art is not possible without tragic elements within society. The challenge in their civilization is to write works of art inspired by nothing so that they inspire nothing. Mustapha admits that happiness is never quite as great as tragedy.