Obama created a lot of enemies in Libya - all of Ghadaffi's former patrons among them. Many of Ghadaffi's patrons are likely now in positions of government/militia power in Libya. Given that the powerful folks don't like what the US did to their patron, many would want revenge. And who among them didn't cheer Steven's death and who among them would put the attackers they celebrate in jail? Obama, in supposedly freeing citizens from Ghadaffi, created enemies for the USA in Libya.
Thus instead of protecting the USA, Obama endangers it with his, and the neo-con RINOs' interventionist foreign policy. What did we get for this - dead soldiers and embassy personnel, and a lot of lost taxpayer money.