There was no way they were going to convict him of murder. Those weren't the circumstances. The only person who deserved to get shot was that pedophile Rosenbaum, he started the whole thing and attacked Rittenhouse. The other two that were shot were under the impression that they were stopping a mass shooting or fleeing murderer. I can't call that murder or attempted murder on Rittenhouse's part either, but I can't say the two bystanders were in the wrong either. Nonetheless, Rittenhouse shouldn't have been there at all, and was there to get himself into trouble or seek the thrill of it. He said himself that he wanted to kill people in a video that I believe he recorded himself.
Him getting off completely scot free is ridiculous, it sets a precedent to allow people to get themselves in killing situations under the mask of "protecting the community". It was not murder, but it was also not humble and completely innocent self-defense. The whole situation could've been avoided if he stayed with his group, concealed a handgun and blended in rather than lug around an attention-grabbing long gun, or better yet, stay away from volatile riots.