I played the video over and over in slo mo and never really saw the punch they alleged PJ threw. It did appear that Griffin may have put a forearm to Tuckers head during the scuffle.
At any rate, it's pretty obvious who the officials are going to side with in a situation like this, especially on Griffin's home court. Not dissimilar from the calls James gets in Miami. There's probably some secret league directive to keep home team stars on the court if there is any doubt who is at fault.
Griffin is a great player, but he's a notorious flopper and has always had a knack of getting under opponents skin. He's also one strange looking dude.