Here are the two things I find really very odd about this case going by what I currently know.
Mixed race/Black guy raised in what appears to be in a predominantly white setting/culture. Should ID closely with whites but shoots mostly whites.
Raised primarily by a Black mother that is a conservative and loves going to the gun range. The shooter is against organized religion which doesnt match with having a conservative Black mother.
I believe he and his mother moved to Oregon only several years ago, Milkweed...from the NY Times article I gathered he grew up in California.