One of the dumbest (yet persistent) Rittenhouse takes. Open carrying in an open-carry state is not instigation. Don't be dumb.
As for this shooting, totally different animal. I don't think it's self defense, and I predict the shooter will be charged and found guilty.
When Carruth (the shooter) spins around, backs up, and fires, Chad is not approaching him in a threatening manner. Chad is standing still with his arms by his sides, and there's ample distance between the two. Objectively, Chad is not a threat to the Carruth when he fires the two shots.
And Carruth's subjective state of mind does not seem to be that of a man that who is fearing for his life either, given his calm, rationalizing presentation immediately following the shooting.
If Chad had been moving towards Carruth, then a claim of self defense would be stronger. If Carruth had killed Chad sooner (but after Chad touched his gun), then a claim of self defense would be stronger. If Carruth had presented more fear, then a claim of self defense would have been stronger. I do not think Carruth has a strong claim of self defense.