I agree that both-sider-ism isn't unique to the left or the right. It's the same script used for two different ends. For the right, it’s a tactic to suppress the opposition. They don't actually believe it, but they’re happy to amplify it because it helps them win.
The accelerationists on the left are a different problem because they actually believe the rhetoric. They take a bad faith argument and turn it into a "pure" moral stance, effectively doing the opposition’s work for free. You can't change the mind of a dishonest actor on the right, but the trick is to get those accelerationists to realize that they are hurting their own goals, since they obviously don't care that they are hurting other people.