Did you see the video? That's pretty clear-cut case of self-defense.
An angry Rosenbaum (after having a nigga moment) chased Rittenhouse and threw an object at him.
Huber hit him with a skateboard while he was on the ground.
Grosskreutz advanced at him with his own gun drawn.
Again, watch the video and tell me why you think this was not self defense. These adult men, two of them with felony records, were chasing and attacking a child.
The issue isn't the video, it's what the video doesn't show.
If the video is the whole story then it's justified. Many of us, however, think something happened off screen to provoke the situation. If he has unclean hands the self defense claim goes away.