I think the cannibalism is symbolic: The destruction of one's idol to become them. Devour them, literally or metaphorically, and you will take what power they have, be it beauty, fame, luxuriousness. For example, Idi Amin eating that guy's liver: Stealing the strength of a rival through consumption. Here it's a fan and the rock star he/she/it stalks.
I think the cannibalism is symbolic: The destruction of one's idol to become them. Devour them, literally or metaphorically, and you will take what power they have, be it beauty, fame, luxuriousness. For example, Idi Amin eating that guy's liver: Stealing the strength of a rival through consumption. Here it's a fan and the rock star he/she/it stalks.