NFL teams generally don't want "Hard Knocks" around. The past few years, they have been practically forced into it.
The main reason is coaches think the HBO show is a distraction. Whether it is or not, that's how they think. And that's just for the preseason and training camp.

A "Hard Knocks" show during the regular season? The Indianapolis Colts are pretty brave.
At halftime of the Washington-Giants game on Thursday night, it was announced that the Colts would be featured during a special in-season edition of HBO's "Hard Knocks," starting Nov.