The US has a long history of letting murderers off the hook when there is a racial component[0]. With someone like Rittenhouse, who has become a darling of the white supremacy movement, the trial is part of an ongoing culture war. And culture warriors are going to do what they always do.
[0] See, for example, the use of jury nullification after the US Civil War.
[0] See, for example, the use of jury nullification after the US Civil War.