If you go to my profile, you'll see I am not a member of the mod/admin team. My views are only representative of me, and not the site.
"Part Time WebDip Dev. From time to time I will have mod/admin status. It's only for development tools. Please feel free to contact me directly with bug reports."
I will direct your attention to the rule you are quoting though.
"Do not make threads or posts that are abusive or degrading toward another member, group of members, or other groups of people."
If someone posts they are a Nazi, then they are inherently making an abusive and degrading statement towards other groups of people (the ones they tried to commit genocide on and still believe to be lesser people then themselves) and in my view, should be silenced, or if the claims continue, removed from the site.
And as the co-author of the rules, I'd say I'm in a better position to judge their application then you. But hey, as always, contact the mods with any concerns.