Mufasa did not become a demigod. What’s happening is the ‘Fisher King’ trope, where the kingdom reflects its ruler. Mufasa was wise and respectful, and so the pride lands thrived. Scar was disorganized, petty, and focused on his own power, so the circle of life broke down. Simba rules like his father once did, so things return to normal. The rainstorm, washing away symbols of death and decay, start the process of restoring the ecosystem. That’s all.
Gotham City has been a festering wound in the DC Universe for decades. It’s a bad place to live. The Dark Knight has had years to turn things around– since he assumed responsibility for it– and he’s failed. - See more at: http://www.caseyjonescaseyjones.com/free-idea-for-gotham-get-out-of-town-literally/#sthash.WrGgh8H3.dpuf