@engineer,
The one thing - it is hard to compare John Wayne and Will Smith - in the sense that (right or wrong) things were much different at the time John Wayne pulled his stunt. People (in my opinion wrongly) tolerated this sort of behavior more so the reaction result to me is more of the period in time.
Either way each reaction is not right.
I do find some of what is in this article really strange. My thoughts were nothing like is stated in this article - I never thought Will Smith could have killed Rock. I never associated his actions with being a wife beater and I am a white woman - I almost felt the opposite he was doing this as it felt his wife was hurt and just reacted emotionally against who was causing this.
But like most things - I feel people over think them. This is a guy who his wife has been through a lot medically. She is getting stronger and more confident (including mentally dealing by speaking positively about her hair loss) and here is some bozo bringing her down again. He took a look at his wife's face after this was said - and wham he lost it. He just had a hard time dealing with his wife being hurt - didn't think and reacted.
I wonder if part of the reason that Rock is not pressing charges is he realizes how hurtful his statement was - at the time did not realize it would be so hurtful and now he feels bad about that.