Banning take effort. Better to ignore and wait untill
they go away.
I can't see what grounds we can ban them on anyway. They are perfectly
entitled to be a Nazi, we may not like it, but "I don't like you"
wasn't on the list of reasons to ban someone last time I checked.
We don't ban people for stating other political affiliations on their
user pages, so we can't ban Nazi's for doing it.