Two better articles on shooting

The CST:

There is a reason why this kind of attack seems to happen more in the United States than elsewhere, and not just because of the relative ease of obtaining guns. The whole mode of thinking behind this kind of ‘lone wolf’ attack was developed in American far right circles, most notably by two highly influential writers and leaders: Louis Beam and William Pearce.

And Chip Berlet at Public Eye:

The shooting today is a prime example of why it is a mistake to ignore bigoted conspiracy theories.