This is the advantage of everyone really, really not wanting a nuclear war. We assume its not really until the evidence it is is overwhelming. And maybe even then.
A friend of mine has (had? it was a while ago) an uncle who was one of the key turners in a midwest ICBM silo in the early 1970s. Having turned into a pacifist hippie (while still working for STRATCOM) he admitted during every psychiatric review he totally wasn’t going to turn that key, not now, not ever, even when staring down a Soviet first strike, because he was totally not going to be that guy that killed thirty million people.
And for reasons my buddy nor her uncle can fathom, they kept him at post.