Print William Shakespeare’s “Romeo and Juliet” has maintained its centuries-long hold on the popular imagination for an obvious reason. Love — particularly of the idealized youthful variety — is never out of style. But reencountering the play in new formats — “Romeo y Julieta,” the Public Theater’s bilingual podcast version (available on demand) and the National Theatre’s original film “Romeo & Juliet” (airing on PBS’ Great Performances April 23) — I see more clearly that romance is only half the answer. The other half has to do with societal division. When Romeo and Juliet fall in love, they transgress not because they are an ill-suited match but because their families are sworn enemies. The context of their headlong infatuation is a blood feud that rages unabated in Verona.