Oddly enough, that upcoming presidential election was the one in which JFK was elected. The rest of this would've been an anachronism if it connects to Kennedy as you claim. (FWIW - I think that line about history teaching us that anyone could be killed is definitely a reference to JFK, but its ahead of its time).

Somewhat related - there's a reference in one of the early scripts of Part II to Kennedy Airport. It was, of course, called Idlewild at that time (before JFK was assassinated).

As great as Part II was, I've always thought the whole story was rushed in order to get the film made, and as a result of that "rushing" some sloppy mistakes were included. Your theory about FFC including the feeling of the time when the movie was made (in the early/mid 70's) is valid, even if it reflects on a decade earlier.