Something that makes fascism a particularly pernicious form of authoritarianism is that it doesn’t just need the population crushed and subservient; it needs to •keep actively destroying• whole subsets of the population in order to stay alive.
Fascism is a fire. Its fuel is the othering of minority groups; its oxygen is fear. It will keep finding — creating, if necessary — more and more “others,” without limit. Unless you cut off that oxygen or that fuel, it will keeping burning until there’s nobody left.