Some argue that we shouldn't refer to Republicans as "conservatives," given their turn toward extremism / authoritarianism / fascism. But the conservative movement worked for years to create the ideal conditions for today's extremism. So I think it would be a mistake to let "conservatism" off the hook. Perhaps it needs a creative modification, but conservatism is the root from which this evil has bloomed. And we must not forget it. This is the logical end result of its core ideas.
I'd go the other way with it.
I think a huge problem is liberals who have been refusing, often explicitly, to engage with the extremist arguments and point out why they are wrong. It has created a vacuum that allowed the extremists to grow, that allowed the conspiracy theories to stand without the debunking that they really needed.
It was all so predictable.
As liberals/progressives/democrats chose to exit the fight this was my warning that they were basically indulging crazy conservative conspiracy theories that would only grow in that darkness. And it worked out exactly the way we might have expected it to work out.
