Any social movement apart from republicans can make an Arthurian story that respects the traditional narrative structures and supports their ideology.
Do you want Emo Arthuriana? The whole death and romantic love stuff, just use like the courtly love stuff and emphasize the dangerous nature of knighthood.
Wanna promote purity culture? You literally have Galahad as a paragon you can use for your ideas.
Are you wanting to promote antitheïsm? Guess what? You can build on Arthur's portrayal in antagonistic roles in saints lives where he is a king who needs to be taught the power of god.
You wanna promote new-age interpretation of eastern spirituality? There's mentions of Arthur goïng to India and bringing Glewlwyd Gafaelfawr his porter with him.
You wanna make it yimby? Describe the urban fabric of Camelot and make it an inherent part of the court's grandeur.
You wanna make it nimby? Make the evil usurpers (a quite common stock adventure is some lords heir has been usurped and the hero has to restore the rightful heir) change the character of the castles and turn change in something analogous to neighborhood character into a strong symbol of that which is contrary to Right.
Do you want to do ACAB? With the knights as standing in for cops? Well, corrupt and rent seeking knights are a good bad guy present in The Marvels of Rigomer. You don't need to go full Mark Twain; you just need to emphasise the exceptional virtue of the round table as unique in this world which is already present as a theme in Arthurian legend, often in association with a perceived moral decay from this golden age of knighthood to the day of the author.
You wanna do leftism? Well, villains are usually already upper class for reasons of getting the right sort of fight scenes because it was generally the nobility that jousted, and most fights in these stories are jousts to the death. So you can absolutely emphasise the evils of the nobility on the peasantry and have the knights rescue them instead of rescuïng a princess.
And you can do a million other takes with almost every worldview that you would like. Any viewpoint can do a take of Arthurian legend and preserve the essential stuff, except if that viewpoint is "monarchy bad" in which case you get that hack Mark Twain writing victorian-era bullshit about armor and I swear if I ever get around to it, I'm putting his character in and owning him in my story. Seriously, you think people wanna overthrow the government right after overthrowing Constantius got them Constans followed by Vortigern who got them into the whole mess with the Saxons?
Arthurian legend has such a depth and wealth of versions that you can have Arthur and his court sort of embody your ideas and the bad guys run counter to them. The exception is if that view is that monarchy is bad, because one of the essential elements is that Arthur is the ruler of a kingdom, and that he is good, and you can make Camelot the agent of the perpetuation of your belief system.