I dont think body odor ever played an evolutionary role. As far as I know body odor is caused by bacterias eating and multiplying whenever we sweat. If this is the case body odor is here because we sweat which isnt that common within the animal kingdom.
(Although dont quote me on any of this, this is just what I seem to remember and Im lazy to look it up - tldr i might be lying)
Bold of you to assume modern day nazis know how zo draw a swastika. There so many strange 'symbols' where it is clear what the goal was, but the shape was too hard to draw for them... Harder to fix those this way