This is not how you run a civilized society. The problem is not so much the trial as it is the events leading up to it and the fact that kids walk around with powerful weapons. But please ignore me, and ignore the future consequences as well, this isn't going to solve anything.
The immediate consequence of the shooting was an end to destructive riots in Kenosha. As an American, I hope future consequences include a tapering-off of destructive pointless riots. If you come to my town, threaten to kill a kid defending local homes and businesses, light a bunch of the town on fire and then pursue and attempt to kill said kid, you deserve whatever happens to you. If Rittenhouse hadn't been armed, he'd likely now be dead.
The riots were not glorified. It was the outcome of the unjustified violence against African Americans.
"threaten to kill a kid defending local homes and businesses"
Rittenhouse is the one who is armed. People might not have attacked him if he's not brandishing a firearm.
Many rioters openly brandished rifles and handguns. One such rioter fired the first shot of the Rittenhouse incident [2], contributing to Rittenhouse's (true) belief that he was under attack. Rioters sent a 70-year-old man to the ER on the first night of riots in Kenosha, breaking his jaw and knocking him out when he tried to stop them burning down a business. Rittenhouse saw all this on TV before he went to Kenosha next day to help clean up riot damage. Incidentally, the parts of Kenosha that burned were mainly minority-owned small businesses and apartment buildings [3].
If you threaten to kill someone, chase them down a dark street and then attempt to kill them at a riot that you started, the fact that they're armed and you're not means squat. Don't try to kill kids and burn down their towns. You'll live longer.
[0] https://www.theatlantic.com/ideas/archive/2020/09/there-no-d...
[1] https://spectatorworld.com/life/antifa-aesthetic-washington-...
[2] https://thehill.com/homenews/state-watch/580073-detective-sh...
[3] https://www.nationalreview.com/corner/new-york-times-buried-...
[1]: The Hill: "CNN ridiculed for 'Fiery But Mostly Peaceful' caption with video of burning building in Kenosha" https://archive.ph/oTwP7
Interesting argument, especially given the video clearly shows Jacob Blake, whom the police shot, was threatening said police with a knife. And he was the "reason" for the protests & riots.
You may be right, and personally I agree with you that bringing a rifle to a partially violent protest should be illegal, and that Rittenhouse is no hero or role model, but nothing you said has anything to do with whether this was murder or self-defense. Even if his possession of the gun had been 100% illegal, that would be a different charge.
It feels like you're conflating several questions: (1) whether Rittenhouse is a good or bad person; (2) whether it should be legal for people to walk around at night with a giant rifle; (3) whether what happened in this particular instance was murder or self-defense. All three of these are actually completely unrelated questions.
Do you also feel that way about the armed vigilantes on the other side of the incident? Was it ok that Gage Groskreutz was menacing people with his gun, and was never charged with a crime, and never even had his gun confiscated?
There were many armed civilians that night with guns, why are you only concerned about Rittenhouse? Is armed vigilantism if a militia says that it is "anti fascist"
Dangerous political gamesmanship between Trump and various mayors and governors got people killed, destroyed a ton of property, and has done permanent damage to the social fabric of this country.