Oh dear. I've blogged before about how Japanese people sometimes don't get that what they are doing is incredibly offensive, especially when it comes to the Nazi thing. I remember one time going into the "weird-cool foreign stuff" store and seeing a display of Mein Kampf complete with a flag that had a swastika, skull, and S.S. lightning bolts, as if it was just one more cool thing you could get into.
So the girls in this video, well they don't really surprise me when they show ignorance, or cheerfully do a Hitler impression at the end.
The hair pin was classic too; only a Japanese girl would think of making Hitler into another cute character.
[tanks to TokyoCooney]
EDIT: The girls had to appologize, or at least their company did.
ALSO EDIT: Here are some cute cosplay Nazi photos. What? Yeah.