I'm not sure what you mean by "morals". If you're implying that Russian knew that the US would never attack, but the Americans couldn't trust that the Russians would never attack, then that would still be propaganda at work.
If some Americans actually believed that the Russians were so maniacal that they would attack, even in spite of Mutual Assured Destruction, then those Americans were foolishly suckered in by propaganda.
If some Americans actually believed that the Russians were so maniacal that they would attack, even in spite of Mutual Assured Destruction, then those Americans were foolishly suckered in by propaganda.