Richiev's version is a good rewrite.
But I think there are a couple of fundamental problems embedded in the premise.
1] The dramatic premise?sets up a false conflict, a false dilemma.? A true dilemma is one where characters are faced with two equally desirable or two equally undesirable choices and they must choose one of them .
The choices in this premise, to cooperate or not to cooperate, are not equal.? So they don't face a true dilemma.? When faced with? the immediate prospect of death, how realistic is it to believe that two people, of polar opposite political persuasions would not put their politics aside to work together to survive?
2] Loglines are about what characters consciously intend to do, not about unintended consequences that follow.? The two political foes don't consciously intend to "re-examine their assumptions";? that is an unintended consequence of having to work together to survive.