The right's newfound Russia Defending Syndrome is beyond parody.
why was the US diplomatic/CIA annex attacked?
Because they were US buildings that the radicals could target easily.
Who attacked them?
What was the attackers' relationship with the US prior to the attack?
Who did Ambassador Stevens meet with just prior to the attack?
A Turkish diplomat
Why was this group not attacked?
Turkey is an ally of the US, Ansar al-Sharia was attacked.