Here's why:
* The Dream's Content: The dream features Mufasa's ghostly apparition, urging Simba to remember who he is. However, it's not a straightforward message. Instead, it's filled with vivid imagery of the stampede, Simba's fear, and Mufasa's accusation that Simba "let me down."
* Simba's Guilt: The dream directly reflects Simba's guilt over Mufasa's death. He believes he's responsible for the stampede and blames himself for Mufasa's demise. This guilt is reinforced by Scar, who further manipulates Simba into believing he was the cause of Mufasa's death.
* Simba's Fear: The dream also speaks to Simba's fear of responsibility. He doesn't want to face the weight of his perceived guilt and the burden of being king. He escapes to the "Hakuna Matata" lifestyle to avoid this.
Therefore, while the dream appears to be about Mufasa, it's ultimately about Simba's inner turmoil and his struggle to confront his guilt and fears. It's a powerful representation of his psychological journey throughout the film.