Easily proven wrong.
Rittenhouse was the only one with rifle, so not only does that prove a rifle was not needed for protection, but the only harm to anyone was caused by that rifle.
And anyone should easily anticipate that carrying a rifle would be provocative and deliberately intimidating.
Which is why Rittenhouse deliberately brought the rifle, not for protection.
For protection one would being a concealed pistol, which would be easier to bring to bear and not provoke someone to try to take away.
There were 5 wounds to one person alone, so then we have proof Rittenhouse did not just "fire a few shots in self defense".
After the first incident, he kept at it, continually provoking in an escalating pattern of deliberate violence.
Rosenbaums past is irrelevant.
There is no indication Rittenhouse ever tried to simply go to the safety of the police, that he gave any warning or fired any warning shots, and in fact at that close range, could easily have chosen a limb shot if his intent was not deadly.