"nazi" is a name people call those they don't like: mother in laws, their bosses, the school principal, political opponents...
it is used so often, it lost a real meaning.
It retains that meaning in 99.98% of political discourse: "[topic] is something I dislike and/or reminds me of something/someone I dislike, and it's the only way for me to express that my enemy is subhuman without sounding like a psycho fascist myself"