We didn't just fail to secure the Benghazi consulate before the 9/11 attack or fail to secure the sites after the attack. That's bad enough.
We also reduced our defenses in Libya despite evidence of threats to our consulate and Westerners in general (tip to Instapundit):
On Tuesday, Chaffetz and the oversight committee’s chairman, Rep. Darrell Issa (R-Calif.), disclosed in a letter to Secretary of State Hillary Clinton details of an alleged April 6 bombing at the consulate. The letter detailed how in the run-up to the 9-11 assault there was an escalation of military-style attacks on Western targets in Libya’s second-largest city. The letter also said U.S. security personnel had requested, and were denied, additional security for the U.S. embassy in Tripoli and the consulate in Benghazi.
Chaffetz went further Wednesday, saying in an interview that the number of American diplomatic security officers serving in Libya had been reduced in the six months prior to the attacks. "The fully trained Americans who can deal with a volatile situation were reduced in the six months leading up to the attacks," he said. "When you combine that with the lack of commitment to fortifying the physical facilities, you see a pattern.”
If only the terrorists had to rely on luck alone.