However, it is the case that American culture is and historically has been built upon white supremacist principles and that the default identity in the US politically and culturally is white, and that therefore white people generally enjoy a status of privilege and political power that other groups do not, and thus a responsibility that others do not. And the links between the Trump administration, alt-right movements and white supremacist groups in the US are well known and documented, even though minority groups voted for him as well.
So it would be just as wrong to dismiss the premise that "white people" are to blame due to pedantry as it would be to blame all white people. "White people" do carry the lion's share of the blame as a community and culture even if not literally every white person does. That's the nature of systemic racism.