I think D&D isn't fascist by default. The default D&D party are murder hoboes with little or no respects for law, discipline, order or usually any particular real world racism. The most accurate description you could come up with is 'D&D is pro-bandit by default'.
But then world and culture design kicks in, and there are all sorts of societies in most D&D/rpg settings that are everything from fascist (lawful-neutral), Nazi (lawful-evil), anarchist (chaotic), libertarian (chaotic-evil), socialist (lawful-good) and so on.
OBVIOUSLY I AM BEING PROVOCATIVE by saying the last 2, it's just plain teasing.. I know we'd never agree on how to place socialist or libertarian on a D&D nine point alignment grid SINCE there are so many different versions of each..
BUT, it's also quite fine for people to write settings or games to be consciously anti-fascist, it's good to think about the political aspects of gaming, even if you don't agree with their orientation.
As a socialist I actually enjoy blowing off steam as a murder hobo libertarian bandit sometimes, and I'd recommend some other people try being a conformist Party member in a one party communist state game sometime (Paranoia?).. so I actually like to play against my personal morals and beliefs sometimes.