You won't, because that has absolutely nothing whatsoever to do with whether or why Gronkowski was suspended. He had no right to hit White like that regardless of what White did to him or what the Refs did or did not call. It feels emotionally like it should be a balancing factor but it absolutely is not. There is no mitigation here.
Gronkowski hit a player unnecessarily, multiple seconds after the whistle, while said player was down and defenseless, and in the process made contact with the head and put that player in concussion protocol. The refs did not make him do that, he did it all by himself on his own responsibility and he has to take ownership of that.
It was an absolutely unnecessary move by Gronk exacerbated by putting the player in concussion protocol. The league will come down hard on him for this and they will be 100% right to do so. You do NOT hit a defenseless player after the whistle under any circumstances, and you ABSOLUTELY DO NOT HIT HIM IN THE HEAD!