I think it's only really become a material issue under Trump.
Generally speaking, he has defined white people as a class of victim, much as every other minority and interest group has done. As part of a larger population of an identifiable group, a small but violent group is concerning.
I've been saying for sometime that the promotion of victimhood is an issue for the Dems also. I preferred the old proud, muscular US individuallism, while protecting genuinely vulnerable groups like children, the sick, the unlucky poor (ie not the deliberately so) and the elderly. But among Dems so many groups claim victimhood status and identify as such. I am not an identity politics Democrat.