There is a fine line between physical basketball and reckless play. The NBA has always celebrated toughness, defenders who fight over screens, bodies that bang in the paint, players who make opponents uncomfortable. But when that line is crossed, and crossed repeatedly, the league owes it to its stars and fans to act decisively. Lu Dort has become the latest and most visible example. The Oklahoma City Thunder guard is undeniably elite on defense. He draws the toughest assignments, pressures ball-handlers relentlessly and sets the...