Read My Heros Have Always Been Cowboys by Peter Golenbock ... it's a history of the Dallas franchise. The entire book is composed of stories right out of the players mouths. If you think the Cowboys franchise had more "good guys" back in the old days, you're seriously deluded. Seriously, you think players are bad now, think when they worked "real jobs" in the offseason on oil fields or as farm hands. NFL players were just a shade above fair carnys in those days. Bob Merrideth smoked as much weed as Quincy Carter ever did (per Pete Gent), there just wasn't drug testing in those days. There are stories of drunken hunting expeditions gone awry by Bob Lilly and LeRoy Jordan, illegal actions, coverups.
The only thing that has changed is the scrutiny by the players and the fans, and the interest on what goes on in their personal lives. Babe Ruth had more prostitutes than homeruns. Mickey Mantle was an absolute mess. None of that stuff was ever made available to the public, even when the media and beat writers knew all about it (of course, they didn't have to fill a 24 hour news cycle in those days either). It's suddenly become a media story as to what players do in their personal lives. It's especially become a huge issue since Goodell made it league mandate. Even in the last year, it's become more and more of a media sensation. I don't believe Tank Johnson is any worse than Leo Carson, but his signing seems to be getting 10X the press.