Obama orchestrated a phony war against ISIS. The “attacks” were just enough for him to appear like he was against them. The “fight” was minimal and allowed for the growth of ISIS.
And Benghazi was one means of funneling weapons to ISIS.
http://www.dailymail.co.uk/news/article-2390642/400-surface-air-missiles-STOLEN-Libya-Benghazi-attack-says-whistle-blowers-attorney.html