This is how Wisconsin’s law is so fucked up: The three men he shot were not working together, were not coordinated, did not know each other. So, on the one hand, Rittenhouse may have subjectively felt under coordinated attack, he was not, but the subjective feeling is what matters for the law.
From Huber:s POV, he was trying to disarm a murderer. Maybe he felt threatened, too? But the law is so fucked, his POV doesn’t matter because he’s dead. In Grosskreutz’s POV, he was approaching an active shooter who’d just killed two men and trying to defuse the situation. When Rittenhouse pointed his gun, Grosskreutz would have been justified under the same law in blowing him away.
In short, the law incentivizes shooting first.
I’m not familiar with other states’ laws. They could also be fucked up, too.