The enigmas of human psychology and culture are writ large in the domain of Gothic fascination with darkness and death.
Aspirations to difference and self-individuation through fashion, personal taste or behaviour are really just an evolution of tribal identity and group membership. Belonging to a group that does not belong to a group by virtue of adaptively-defined expressions and experiences of individuality is still to belong to a group.
Counter-cultures that become popular inevitably invalidate themselves. You cannot actually exist on the periphery when everyone else inhabits the same space.