Aesthetics, such as art or culture, is crucial to the survival of man's mind; the mind is crucial to man's physical existence. Personally, I find some appeal in certain nihilistic forms of art in their appropriate setting, or dissonant sounds within a musical composition. But consider the effects on a mind that ONLY consumes nihilistic art, loud irritating forms of music, and blood-sport as entertainment. I've met such people; they're not very rational, neither are they very good company in the long run.
Artistic creations are nutrition for the conscience.