So, it's pretty clear to me he and his other heavily armed friends were operating as vigilantes (noble or not). The authorities came in what looked like tanks and riot gear and told them to move out numerous times, and they disobeyed the law. Again, some see that as virtuous with all the 'what are you supposed to do when no one is there to help those empty businesses (that never asked or paid for help)?'. End of day, they operated outside the law. What's worse, they antagonized and instigated other non weapon carriers to start something with them. Again, gang mentality. I watched other similar videos of armed men (during BLM), peacefully standing right in front of boarded up stores, and not engaging crowds at all. I could argue their intentions were more virtuous.
All that being said, I would agree that if that mental guy lunged at Rittenhouse and tried to grab his gun, one could argue he defended his life. Even though he disobeyed the law and was part of a party that arguably stirred up more trouble outside of the law. Those are lesser infractions. You are basically saying that it's ok to go stir up trouble and engage with others, while admonishing heavy artillery, but the moment someone challenges you back, you are perfectly right to fire. Maybe you could argue he specifically was not intentionally instigating others, but I watched footage of those he traveled and affiliated with, and they clearly were. He was just the one they chose that moment to engage.
That being said, I can't for the life of me understand how the same posters who are adamant about the defense angle, and forget all the motivations, the external events, and whatnot, only care about that moment he feared for his life, and reacted...
What about the guy who had an angry mob literally smash down doors and windows coming for him, to very illegally access members of congress, threatening to kill and hang members. And when that guy was under even worse duress and they were smashing down windows to get to him, he clearly told them to stop, they wouldn't, in response he fired under that horrific duress and fear for his life. And the kicker is he was legally authorized, trained, and paid to do so. The same people on this board lambasted, vilified, and demanded he get some retribution for it.
Why such a huge difference in viewpoints other than partisan?
It is clear that partisanship, or to be more exact, bigotry against those who bear arms as civilians, is a part of this trial. It is also clear that there is a segment of the population that can't stand open carry, and that views protection of private and public property by citizenry to be highly outrageous, and a threat to society and the public order. Partisanship, on behalf of "protestors" and those more violent and destructive, is an added layer to the bigotry.
Consider the prejudicial words you use "vigilantes", "gang mentality", "outside the law"... this animus is baked into your assumptions.
A thought experiment, let us suppose they were just people who wanted to act in the same capacity as civilian security guards, except doing it gratis without pay? Suppose one of them, also wanted to help people injured, and help fight property fires? In a non political context, this wouldn't be an issue, would it? In fact, it would be good Sarmatianism.
Deep down I think severe critics of Rittenhouse know that, so they feel compelled to color the narrative... a small group of people want to help a property owner, and so they become "vigilantes". If they do so in concert, they have a "gang mentality". If they verbally reply in like tone and content to those yelling for them to leave or else, they are "provacators". And if by their very presence with a firearm, just like many in the mob, are attacked by the mob...its their fault.
As I posted earlier, this is typical judge mentalism directed at the victim of a hostile mob, the belief that somehow the mob are innocent because they just had to do it, is blaming the victim for what is, in the end, the fault of those who attacked him.
Those killed or wounded had plenty of time to run away, not engage, or call 911. They had plenty of time to think about not charging an armed man from behind, and not bringing and brandishing there own firearm (as one did). Had they survived, and Rittenhouse had not, some couldn't have even come close to having a self defense claim.
You need to reflect on this.