The use of informants and sting operations has become a major tool in the fight against domestic terrorism, illustrated in the arrest of two men charged with plotting an attack on a military facility.
David Lynch, head of the racist skinhead group American Front, was shot and killed in his home near Sacramento, Calif., on Wednesday.
Since 9/11, the number of Muslim-American terrorism suspects and perpetrators has averaged about 16 a year. Last year was slightly higher, but way down from 2009.
In the halls of Congress, the Arizona shooting has prompted calls to tone down violent rhetoric. But it will take more than reformed lawmakers to change politics' tough-talking culture.
Early reports suggest that the philosophies of shooting suspect Jared Loughner are tangled and largely incoherent – ranging from nihilism to 'lucid dreaming.' So far, there does not appear to be clear link to talk radio or hyperpartisanship, though that could change.
The man charged with murder in the Holocaust Museum shooting gave clear clues about his hatred of Jews on the Web. But it's hard for law enforcement to filter anger from murderous intent.
In 1996, a Kansan with the same name was arrested with bombmaking materials in his car trunk.