You must not have been watching a lot of NASCAR lately. They still have plenty of bumping, fighting, and cussing. Did you see when Gordon deliberately and obviously put Bowyer in the wall, even after Gordon was black flagged to get off the track? Bowyer's pit crew jumped Gordon as soon as he got out of his car, and Bowyer sprinted through the pits to Gordon's garage to try and find him. It was straight out of Days of Thunder.
As for no bumping, I'll just leave this here:
They changed their tune last season after the ratings took a dump. Still not what it used to be.