I should also add that i'm of the mind (as of right now) that it can be about many things.
I don't really want to think that a person who kills 9 people like this is mentally stable, but i'm also not willing to dismiss that he could just have been a hateful racist, either.
Obviously in the world of media and politics, each side will use whichever words further the narrative desired, which is why i think it's hard to actually see a positive change come from these things.
How about a hateful racist that was mentally ill? Covers all the bases.