Couple that with who deleted the emails? Huma and the MB? Did they all have Top Secret security clearances? Who maybe downloaded the whole server on a thumb drive? The burden of proof is on Hillary to proof her system wasn't hacked, either in house or by super-hackers. She can't prove this. There's no way of knowing and we can't take the risk.
All of this means she's subject to blackmail and maybe bribery (both ways).
These facts preclude her from ever running for President of the United States.
This potential loss of National Security Top Secret and other levels of Classified Information deserves a Special Select Committee investigation as soon as possible.