The audience is the other half of art, movies, and literature.
For Hitler, American Westerns were his all time favorites.
He loved the holocaust of the Indians.

Insightful artistic visualzation is also a skill of excellent readers.
Authorship is the other half of the 'performance'.

The audience for conspiracy theories are low-information sponges anxious to soak up any available nonsense. They are seldom aware of the hidden agendas, as well as the obvious agendas, of the 'nonsense'.

The audience are also the preservers and care takers of art.
You don't have to be a museum curator to have beloved favorites be it music, art or literature.