Edwards causes The Big One at Dega

Carl Edwards bumped teammate Greg Biffle to help him move forward better,  but did it in the turn and caused the Big One that took out a lot of cars and Chasers.  Edwards took the blame, saying it was his fault, saying something to the effect that they had been bumping like that all day and they must have just lined up wrong.  My question is, why NASCAR didn't put a stop to the bump drafting in the turns like they've done in the past?  Before, NASCAR sent out many warnings to drivers about bump drafting in the corners, telling them not to do it, yet in todays race, they were bump drafting all over the track, even in the corners.  If NASCAR had stuck to it's previous "no bump drafting in the corners" stance, this Big One may not have happened.  Other than Edwards and Biffle, other collected in the wreck were Dale Earnhardt Jr., Kevin Harvick, Kyle Busch, Joe Nemechek, Reed Sorenson, Matt Kenseth, Travis Kvapil, Michael Waltrip, Dave Blaney and Juan Montoya, many of those cars were doing well and had a chance to win.

Tony Stewart won the race after NASCAR determined Regan Smith went below the yellow line to try and pass Stewart, Smith contended that he was forced down below the line.  This is Stewarts first win at Dega. 

Tires seemed to be a problem today too, causing a few problems.

Your thoughts?