This is my theory. The lack of communications security caused by Hillary using a private server, revealed to the terrorists when the Ambassador would arrive and WHY. The communications revealed that there was a CIA plan to illegally transfer weapons to help the Syrian rebels. THAT is most likely why alQuaeda had to kill the Ambassador to prevent the transfer.
Obama and Clinton could not act without officially revealing the US role in the secret clandestine operation. Obama and Clinton to protect Obama's re-election let the attack and murder of the Ambassador occur without attempting a rescue of the defenders. Eternal shame on Clinton and Obama.
According to information that came out a few days ago, she was NEVER issued a state.gov email account. How did anyone think she was communicating on official business?
I don’t for one minute doubt that putting so much highly-classified information on an unsecure email network was part of the quid-pro-quo for contributions to the Clinton Foundation. I do, however, wonder just how many other actions by ISIS and a host of foreign governments have occurred or will occur because of the information contained in those emails.