Consider these sentences:
(1) We don't want to "force" or "impose" any outcome on you.
(2) We don't want to "force"—or "impose"—any outcome on you.
(3) Nothing will be "forced" or "imposed" on anyone.
(4) Nothing will be "forced"—or "imposed"—on anyone.
(2) and (4) have em-dashes in order to ensure a particular meaning in which the two verbs (in quotation marks) are interchangeable. But are the em-dashes completely unnecessary? Does syntax already impose this logical relation (of interchangeability)?
Consider (1). The first verb (in quotation marks) might be intransitive, right? This would be unusual but not impossible. And there might be other ambiguities too; that's just one ambiguity that I noticed. The em-dashes would eliminated that ambiguity.