Here is an article from the Chosun Ilbo regarding the effects on immigration on the Korean-American population. It talks about the regular issues dealing with the stress of immigration, etc.
But the part that I found interesting was a quote that said that Virginia has a comparatively high component of white supremacy, which could have contributed to Cho's troubles. We touched a little bit on the idea of generalizing races and nationalities, and I found this one amusing. I'm not sure if any of you have been to Centreville, where Cho is from, but it's not exactly Mississippi circa 1860. It's a relatively cosmopolitan suburb with a significant Korean population. But now the Chosun Ilbo has run this story, and Koreans are going to be under the impression that Centreville has a problem with white supremacists.
If nothing else, click on the link to see a picture of K-town in L.A. From the looks of the cars on the road, this file photo must be at least 30 years old.