If that were a valid argument then he would have been attacked by everyone just for bearing the firearm. He was not. Not to mention the fact that he wasn’t attacked for bearing the gun, he was attacked for extinguishing a dumpster fire.
I have to ask: At what point do you hold Rosenbaum responsible for his actions, i.e., attacking Rittenhouse? Or do you hold him responsible at all?
Everyone wanted to attack Rittenhouse because of the provocative rifle.
But clearly what made the rifle provocative was that it was threatening, so almost no one had the nerve to attack him, since they were unarmed.
But once he shot Rosenbaum, no one had any choice any more, and had to attack him, since he was murdering everyone around him.
The only reason more did not attack him is that he ran away.
I have never seen video of the early part with Rosenbaum, so I am not sure how it started, but Rosenbaum was unarmed and Rittenhouse still shot him 4 times, at close range, with a high powered rifle.
That is NOT self defense.
The castle doctrine and stand your ground, do NOT allow for an escalation.
So you can't use a weapon on an unarmed attacker unless you are an invalid or something like that.