Let's say a person who was part of a Black Lives Matter demonstration had brought an automatic weapon and shot and killed two people. We all know that the collective view would blame the BLM movement. After all, if people on lower groups of a hierarchy do something viewed as undesirable, it is considered to be a reflection of the entire group when hierarchies are in operation.
However, since Kyle Rittenhouse is part of a group of white males, what could he possibly do that would reflect on his group as a whole? Not too much, as when people on top of hierarchies do something that is considered undesirable, then that one person is viewed as acting as a loner when hierarchies are at play. We are so unaccustomed to holding top groups accountable for their collective actions and privileges, that we are programmed to not attribute top characteristics to the group as a whole.