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Wrong…it has nothing to do with negligence and absolution. You want absolution see the Pope.
The Marines that protect US Embassies are under the control of the DOD.
That is a fact, it has nothing to due with a court of law and an imagined charge of negligence that has never been brought by a prosecutor.
We are a nation that operates under laws, rules and regulations. Just because you want the Secretary of State to be responsible for physical defense of those within an embassy or consulate building, doesn’t make it so. The only non-DOD official who may direct the marines is the President who is also the Commander in Chief of the Armed Forces.