Self-indulgence can be harmful for acting because it can cause the actor to become too focused on themselves and their own desires rather than fully committing to their character and the story being told. This can lead to a lack of authenticity in their performance, as they may prioritize their own ego or personal agenda over the needs of the scene or the production as a whole. Self-indulgence can also result in narcissistic behaviors that can be disruptive to the working environment and make it difficult for the actor to collaborate effectively with their fellow cast members and crew. Ultimately, self-indulgence can hinder an actor's ability to create a truthful and compelling performance.
