Play it again, Sam: Every once in a while, I miss Sam Francis' VDARE columns and will go back and read an old one. Today was one of those days, and I found this article: Why Immigrants Kill. He was writing about the Hmong immigrant who shot all those hunters, but his words could apply to Cho:
The link between immigration and violence is that the aliens lack roots in the society and civilization into which they import themselves. The people they see aren't their people, and their moral and social norms aren't theirs either. Being strangers in a strange land, they feel little obligation to it or its members.
For immigrants on the fringe, the resulting tensions can overflow, and it's not easy even for those not so fringe.
Sociologists write all the time about the evils of alienation, but somehow ignore immigration as an important source of it. The connection is a bit hard to miss since the word "alienation" contains the word "alien" in it.
Anyway, my point is not about immigration and alienation, it's that Francis' writings will shake you up, so you should check him out if you haven't.