No one has asked, but no one else was asked either, so here is my take, take it or leave it. Trying to be impartial as possible, which I think I can as I have no love for either Harvick or Busch the younger, I see plenty of blame to spread around. Plus I will add some blame to Clint Boyer. If he had not tried to go three wide where two wide is an adventure, this whole incident most likely would not have occurred. It was Harvick's bouncing off of his teammate over into Busch which pushed Kyle into the revenge mode.
Harvick giving Busch a tap in the rear bumper in the previous turn didn't help either. Kyle flagrantly hooked Harvick turning him dead right through the middle of the pack. How he managed to go through a tightly bunched pack not once, but twice without taking out more cars was unbelievable. Kyle's disregard for the other drivers and their teams just to get back at Harvick, who didn't even hit him intentionally the second time, to me is the most grievous of the actions taken. I don't have a problem with giving back in kind when someone does you wrong, but not when you take out innocent cars doing it.
Harvick initiated the actions on the cool down lap and on pit lane, and Busch certainly did his part punting a driverless car where people were again was the more risky move. So I have to spread a bit more blame toward Busch. IMO, JMO.