Everytime the Right Wing Extremists turn to violence their political organizations always state, "It was a nut case." I agree.

...Von Brunn's quiet death contrasts sharply with the brazen violence he unleashed June 10 in what prosecutors have described as a suicide mission, an attack that shocked the nation and sent tourists scattering for cover on a busy downtown street....

The question remains what gave him license to kill?  Do I have to answer that question or is it completely obvious?