Coach K has been utilizing the OAD for years. That team that lost to Mercer had Jabari Parker. The team that lost to Lehigh had Austin Rivers (I think).
K gets a pass from the media because Duke is the most prominent program in the country, and ESPN's own product that they have want to push, not tear down. He also gets a pass because he is likeable, and has humility. It's difficult to go after the guy given all he has accomplished and the respect he has for his opponents.
Duke is no different than any other major program that recruits OAD talent, it's just sort of an elephant in the room that nobody really wants to touch. They have a history of pushing a majority of their players to Sociology degrees also.
But again, there has just been, as the OP put it, silos of goodwill.
If media starts attacking all the greats for all their faults, the sport will be left with nobody to admire. As much as we appreciate our guy for his post season success, and graduation rates of the players over the years, he's kind of a jerk in a lot of ways and he had his own little issue there too.
Really, when you get down to it, none of these coaches are all that admirable - they are employed in a cut-throat business.