It is with a twang of guilt that the archetypal bingewatcher of Netflix’s “Making a Murderer” realizes that the taut, expertly-told story he or she is watching could be summarized as though it were the schmaltz-ified voiceover in a trailer for any puffed-up TV legal drama. The narration writes itself: cops corrupt to their medalled gills. An unwitting, simple man in the slammer for a crime he (apparently) did not commit. Two lawyers on an All- American crusade to prove his innocence. All this with an uncomfortably intimate Midwest backdrop just naïve enough to be rocked to its core by the murder of the new millennium, and any viewer familiar with In Cold Blood and the past few decades of American true crime will be instantly at home.