If you read the testimony of one of the guys Rittenhouse shot - the guy even admits under oath that Rittenhouse only shot him AFTER he pointed a gun at Rittenhouse's head. In other words - it WAS self-defense. Now, you can certainly charge Rittenhouse with illegally carrying a weapon, etc., but he did not shoot anyone until he was attacked. The video shows him running away from people chasing him. He was trying to get away! He was NOT chasing AFTER anyone!
Here is an article with a quote from the guy who was injured: https://www.cbs58.com/news/kyle-rittenhouse-trial-enters-week-2-survivor-testifies