The smartest thing Sam Levinson did when he created “Euphoria” for HBO was to make his narrator and heroine an unregenerate addict who was also an idealistic innocent.
Rue Bennett ( Zendaya) was our guide through his overheated vision of suburban high school life circa 2019-22; her slapstick ineffectuality endeared her to us, and her nonchalant reactions to her friends’ behavior — a shrug, a whacke…