Point 1: There are a lot of libs in military families, and those libs might decide to vote Green in protest of Hillary. Or their energy drops when the know what kind of creep she is.
Point 2: Truth and falsehood matter to a lot of people.
Last but NOT least: Military families get energized over outrages like this.
Look, I understand the Benghazi issue, soup to nuts.
I just think that anyone who is motivated to vote by it is already on board, and that VRWC attacks on Hillary over it are a motivator for her voters to show up.
It’s a prudential judgement, not a value one, and of course YMMV.