Understandable, but to blame her as opposed to the POTUS makes it seem illegitimate. If you're going to attack the top, then you attack the person ultimately responsible for foreign policies. Well, that's what the GOP was doing before the 2012 election. Conveniently how the attacks 100% switched to HRC after President Obama won re-election.
1. Clinton was the most directly responsible for the decisions regarding diplomatic security.
2. Clinton was the most responsible for the decisions made during the attack itself.
3. Clinton was the most responsible for the decisions (and arguable coverup) that occurred after the attack.
All of that occurs because of her then position as Secretary of State. Um... But honestly, most of the blame falls below her level, but it doesn't matter really because of...
4. Clinton is the one running for president.
And honestly, it's irrelevant except as red meat anyway, since as a rule government employees cannot be sued for merely performing their jobs, even if they performed them poorly. But as red meat, this very fact also falls nicely into the "rigged system" narrative.