Exactly. Doing so in a
deliberate, targeted manner was unthinkable. This is culturally related to the American axiom of never leaving anyone behind (fellow citizen, soldier, etc). Be it hero or traitor, we will go to extraordinary lengths to bring a citizen home for proper, lawful, respectful treatment.
The president who "allowed it" (how can I put this very tactfully) was likewise, as you put it, not so immersed in the culture on a daily basis (to wit, raised outside the US) - exemplified with Anwar Awl Alaki and Benghazi.
(Am trying to handle a hot topic delicately, pointing out differences.)