Mike the Usurper wrote:
How many lefty attacks have there been? Oh that's right, none.

Well, there was the Weathermen:

Harvey Klehr, the Andrew W. Mellon professor of politics and history at Emory University in Atlanta, said in 2003, "The only reason they were not guilty of mass murder is mere incompetence. I don't know what sort of defense that is."

The UnaBomber

Injured 23 people and killed three...

Olde Time Anarchist Bombings which may still be an issue.

Also one cannot avoid mentioning the cache that the ruthless Che Guevara has developed on the left. I recently had a difficult time trying to explain to a Russian emigre that American teenagers who walked around with pictures of "that murderer" on their t-shirts where not necessarily advocating violence.

People kill for all kinds of ideological reasons.

RE: Gunman, guard shot at Holocaust museum - Crime & courts- msnbc.com