Sorry, after thinking about this, I basically think that “unilateral action” is just a confusing choice of words. Let’s replace it with “being given substantial purely destructive power, and wielding that power responsibly,”, because I think while there was a substantial unilateral component to the cold war, I don’t think Petrov’s choice in particular was that reliant on unilateral considerations.
Sorry, after thinking about this, I basically think that “unilateral action” is just a confusing choice of words. Let’s replace it with “being given substantial purely destructive power, and wielding that power responsibly,”, because I think while there was a substantial unilateral component to the cold war, I don’t think Petrov’s choice in particular was that reliant on unilateral considerations.