As dirty as it makes me feel I can't jump on UP for this one. Since WWII Nazis have become a virtual byword for extremism. Mostly because of the holocaust. Attempting genocide is a pretty extreme position. Unlike many who might claim to be moderate Nazis, the particular poster, appears to acknowledge that the holocaust occurred. Nor do they condemn it, in fact they implicitly endorse it.
I think its hard to consider yourself a moderate if you support the genocide of jews, gypsies and homosexuals in continental Europe.