There doesn't need to be a clear "bad guy" in every situation. Situations can escalate and get out of hand without any individual actors with bad intentions. So it's entirely plausible that the people charging Rittenhouse thought he was a terrorist and wanted to disarm him, and it's entirely plausible that Rittenhouse feared for his life when he shot them. To illustrate my point:
Suppose there are two people at two corners of a dark alleyway. They both hear a gunshot towards the center of the alley and draw their pistols in self-defence. They take a few steps and now see each other holding a gun. Each one raises his gun at the other, thinking that's the shooter. One fires and kills the other. AFAIK it would be justified self-defense
Suppose there are two people at two corners of a dark alleyway. They both hear a gunshot towards the center of the alley and draw their pistols in self-defence. They take a few steps and now see each other holding a gun. Each one raises his gun at the other, thinking that's the shooter. One fires and kills the other. AFAIK it would be justified self-defense