It is not wrong to leave your house with your gun, nor to go to a public place and stand there.
Rittenhouse did not do that. 17 year old Rittenhouse left his mother's apartment in Illinois, crossed the Wisconsin border, obtained a dangerous weapon from, "a friend". He then went into a riot prepared to use the deadly weapon.
There are so many details missing from this story. It will be interesting to find them all out.
Rittenhouse also dropped out of High School, he certainly was not the smartest 17 year old.
It is not wrong to leave your friends apartment with your favorite gun and to to a public place and stand there.
He went to the "mostly peaceful protest" to use the gun in it's intended fashion, ie to use it's presence to deter aggression.
It worked. The mob did not attack and destroy the property they were defending.
Unfortunately, the police forced this lone teenager to be stranded by himself in a mob controlled war zone and he was attacked by the mob.
"It worked. The mob did not attack and destroy the property they were defending."
The law does not allow lethal force to protect property you neither own nor operate.
It does allow you to stand there and defend yourself if attacked.
And it worked. They stood there, and the mob saw them and was deterred.
If you consider that behavior against the law, you should contact the local police and demand they issue warrants against the people that had guns and stood there.
Now, you will pretend to be too stupid to understand that you were talking about his and his group's intention, and not what happened with him, when the police forced him away from his group.