I don’t know that your characterization of Stevens is correct.
William F Buckley was using the State Department as a Cover when he was kidnapped. Political Officer/Station Chief.
Deputy Principal officer and Political Section Chief
-Jerusalem , Israel
Political Officer - Damascus Syria
consular/political officer - Cairo, Egypt
consular/economic officer in Riyadh.
Stevens had been around. He has been with the Foreign Service since 1991
The June appointment may be just a coincidence, but I'm betting it isn't based on Obama's track record of putting competent government workers in harm's way to protect his incompetent (or traitorous) appointees.