As far as the rest, I've found that those more interested in placing blame than finding a solution are usually harboring an agenda...supporting/denigrating the GOP, Libertarians, Buchanan, Keyes, Klayman, etc. The hysteria is the same, all that changes is the hat. Generally, I have no use for them.
Right now, IMO, there will be no return to reasoned discourse until the immediate shock and anger has been vented. This is understandable.
A tremendous number of people are learning that they have a real enemy. This idea, 'a real enemy', is absolutely foriegn to them. They have to learn to think in terms of someone actively wanting to kill them. Most people have never concieved of this idea, much less had to live with it.
Their worlds are changing in ways they cannot imagine....much like so many people had their worlds end in a flash of light, pain, thoughts of "Why G-d?".
Regards,