A reader writes:
Not so much accidental Nazi aesthetics as reflecting the influence of Soviet Constructivism. The aesthetics of the "YouTube Propaganda" video echo the iconic style of early Soviet design, such as that of El Lissitsky and any number of classic Soviet posters from the twenties through WWII. Nazi propagandists freely appropriated constructivist imagery, so it's not at all surprising to see a resemblance. Given the references, I'd be surprised if the aesthetic was a coincidence. It can be viewed as both an extension of the visual rhetoric of Soviet propaganda and a means of portraying the U.S. in terms of fascist iconography.