As far as I can tell that’s not because of a real difference in self defense law, but because of a difference in gun laws. But the gun laws in America are what they are. Many people at this riot were armed: https://vimeo.com/461063053. Listen to all the gun fire at the end of the video.

Judging Rittenhouse as if he was in Germany makes no sense. Watch the video—this wasn’t Germany, it was Iraq. In Germany, the police would never have allowed armed rioters to burn down multiple city blocks over two days.