“Psycho” helped launch a wave of movies centered on disturbed individuals who embark on killing rampages. The nineteen seventies delivered films such as “Haunts,” “The Toolbox Murders,” “The Driller Killer,” and “Don’t Go in the House.” "Maniac" follows in the footsteps of these kinds of pictures, incorporating elements from “Dirty Harry,” “Dawn of the Dead,” and “The Warriors.” The film portrays a disturbing view…