Final answer:
Lip reading is not considered a vital component of deaf culture because it does not hold the same cultural significance as sign language, literature, and theater, which are deeply embedded in the deaf community's identity.
Step-by-step explanation:
The aspect of deaf culture that is not a vital component because of its expressive power and historical significance is lip reading. Deaf culture highly values the traditions of using sign language, engaging in deaf literature and theater, all of which emphasize the visual aspect of communication and the community's identity. Lip reading does not hold the same cultural significance as it is often associated with attempts to fit into the hearing world rather than embracing the unique aspects of deaf communication.