Dr Jekyll and Mr. Hyde (1912)

Is Jekyll a sincere scientist, who becomes the unfortunate victim of his own research? Or is he a mad scientist who craves the hyped-up stimulation of the drug he's discovered? Or is the drug actually nothing more than a placebo, that provides him a pretext for violently escaping his staid bourgeois existence? Or is he actually a psychopath who imagines himself as a scientist, and imagines that his violent psychotic episodes result from a drugged state? A multitude of possible interpretations is one reason for the enduring popularity of this tale.