A couple of problematic thoughts:
1. Does anyone else wonder how a bombing here expresses anything of importance about Chechnyan politics? Maybe the fact that the U.S. is ignorant about the world was the point? (Unlike some others I don't see boredom, madness, or amorality as being part of the bombers' motivations.)
2. While I am for putting restrictions on gun magazine capacity, background checks, etc., I think the pro-gun citizens have recognized something that bears thinking about. And that's the huge disconnect between the average citizen and power. Just look at the army -- tanks and all -- that has gone after 2 men in Boston. The people who get swept up in the wake: There were reports & photos in the middle of the night about a man who was seized and forced to strip naked in the street, then put in a squad car, then had to get out again and be interrogated for longer, standing in the street -- all while he remained naked. He appeared all over the internet news. He was released, because they had the wrong person. But it shows how the authorities can do anything to you.