Well, Nazis were still a foreign enemy army (even before the true nature of their atrocities were revealed and they became an almost universal byword for evil).
In this case we're talking about an event on American soil, with American citizens involved. The political discource surrounding the event remains contentious, and it is a highly divisive issue. So yeah, its probably not wise to use it as a gimmick so soon, at a time when the country still hasn't come to grips with what happened.