Yeah, it was a confluence of poor-written policy, irresponsibility, and carelessness. I disagree with you a bit; the Secretary of State should have known better. In fact, she was informed, but disregarded it. The FBI's finding too, which I missed, is that information DID, in fact, end up in the hands of hostile actors. So there were consequences. But no intent, which is what sunk Petraeus, and what the right is not understanding today.
I hope Hillary has learned her lesson, in any case. Now that this is settled, and thankfully before the convention, we can focus on coming together as a party to beat Trump in November.