There is a middle road. One of the people that he shot, but I don't think that he killed. Was armed himself and had drawn his gun when he chase him. I might have to see if I can find a breakdown of the shootings.
EDIT:
Rather than the video, which can be rather disturbing I am going to quote from the Wiki article on this. The first confrontation is key. It is the one where the prosecutors are most likely to get a murder charge against him:
The beginning of the first confrontation between Rittenhouse and Rosenbaum was witnessed by McGinniss to whom it seemed that Rosenbaum and other protesters were moving toward Rittenhouse, who was trying to evade them; Rosenbaum then tried to "engage" Rittenhouse, but Rittenhouse managed to avoid this by sidestepping and running away.
[6][39]
The remainder of Rosenbaum's confrontation, and the following incidents with Huber and Grosskreutz, were recorded in cellphone footage from multiple angles, including the moments of the shooting.
[40] Video footage showed Rittenhouse being pursued across a parking lot by Rosenbaum,
[28] who threw something in Rittenhouse's direction,
[41][39] identified as a plastic bag.
[6] As Rittenhouse was running from Rosenbaum, two shots could be heard, one from an unknown third party, fired for an unknown reason, and one from Joshua Ziminski, who fired a self-described "warning shot" into the air,
[42] causing Rittenhouse to stop running and turn towards the sound of Ziminski's shot.
[28] McGinniss stated that the sound of the shot was the moment Rittenhouse "went from running away to aiming his weapon."
[42]
Then, according to Kenosha County prosecutors, Rosenbaum engaged Rittenhouse and tried to take his rifle from him.
[43][44][5] Rittenhouse then fired four shots, hitting Rosenbaum in the groin, back, and left hand. The bullets fractured Rosenbaum's pelvis, perforated his right lung and liver, and caused additional minor wounds to his left thigh and forehead.
[45] Rittenhouse remained near Rosenbaum as McGinniss began administering first aid. Rittenhouse then made a phone call and was heard saying "I just killed somebody," and then fled as more protesters arrived.
[5] Rosenbaum died shortly afterwards.
[45]
Rosenbaum, the first man to die, was part of a group trying to chase Rittenhouse down. He grabbed for Rittenhouse's gun according tot eh prosecutors. That is going to sound like a valid self defense claim. Please note. There were shots fired before Rittenhouse fired himself. That is going to add to his defense.
Video from another angle then showed Rittenhouse being chased down the street by several protesters, one of whom allegedly struck him from behind in the head, knocking off his cap,
[46] shortly after which Rittenhouse tripped and fell to the ground.
[47] According to the criminal complaint, at that point, protesters were heard on two different videos yelling "Beat him up!," "Get him! Get that dude!," and "Get his ***!"
[6] One of the men who had been chasing him allegedly jumped and kicked Rittenhouse while he was still on the ground – Rittenhouse fired twice but missed the man.
[7]
Next, according to court records and video footage, another protester, Anthony Huber, "made contact" with Rittenhouse's left shoulder with a skateboard as the pair struggled for control of the gun.
[9][6][48] As Huber was pulling on the rifle, Rittenhouse fired once, hitting Huber in the chest, perforating his heart and right lung, causing his rapid death.
[6][49]
Again, this sounds like self defense. This is not looking good for the prosecution.
And the last shooting:
Gaige Grosskreutz approached Rittenhouse while he was still on the ground but stopped and put his hands up when Huber was shot. A complaint filed by the Kenosha County Clerk of Courts stated that Grosskreutz appeared to be holding a handgun,
[50] which Grosskreutz later confirmed.
[51] When Grosskreutz moved again towards Rittenhouse, Rittenhouse shot Grosskreutz in the arm, severing most of his bicep.
[9][52][53] At least 16 gunshots from other sources were heard on video during the time that Rittenhouse was on the ground.
[28]
You do not move towards a man holding a gun when you were part of a crowd that was chasing him. This too appears to be legitimate self defense.
https://en.wikipedia.org/wiki/Kenosha_unrest_shooting#First_major_confrontation
He is probably going to walk on the murder charges. There may be other lesser charges and hopefully he will get a guilty verdict on one of them. He did not fire first. He was being chased and attacked by a mob. Should he have been there in the first place? I don't think so. But then the same could be said about the armed people that were protesting.