I agree, censorship was melting away faster than L.A. by then, and there was nothing even Hollywood's idiot censors would have found objectionable about the events in this film. There's nothing in PIYZ that's really unfavorable to the government, military or anyone in authority: it's your average red-blooded American citizens who are the greedy, panicking dopes. In fact, both the armed forces and civil defense authorities come off pretty well in this movie -- depicted as being calm and in charge to the best of their ability...
...and, of course, in the end...WE WIN!!!
"Well, ding-ding for us!"
Besides, movie censors were more concerned about banning female nudity than scenes of shooting people in the head -- by way of trying to keep our minds pure, Christian and unsullied -- and there was certainly nothing in Year Zero that ran afoul of that particular stricture...although the floating bra scene was pretty risque.
I don't know -- you may be right. I didn't go back to check, but relied on 45 years of sporadically seeing this movie! But it's quite possible I "slipped" up.
Still -- bra, slip, panties, teddy, open-crotch lap-dancing outfit -- ooh la la, non?
Plus we see Marilyn on a bed later on in her house -- and clearly no good girl would be sitting disheveled on her bed in the middle of the day had she not been r-a-p-e-d by b-e-a-t-n-i-k-s...if you get my 1962 drift....
Americans believe(even more in 1962) that they were the greatest people in world history. PIYZ depicts these superiors beings suddenly beginning to run amuck. Thought that might be a problem.
"Americans believe(even more in 1962) that they were the greatest people in world history."
???????????????? Who is more self-crtical than Americans? Then and now. I think you are mistaking them for the French, who have never been wrong from Vercingetorix to le Grande Charles