There's a depressingly common tactic of using the Holocaust to defend current genocide and atrocities, one that has been very effective until recently. It's exactly the kind of strategy that always assuming good faith allows for, and what I'm warning against. Unfortunately, the backlash against allowing bad actors to use victims as a shield is emboldening bigots. Another knock-on danger of the culture of unlimited civility is that it will eventually end and the overcorrection will see a lot undeserving people hurt.

This isn't the danger with assuming good faith.

It's the danger with not updating your behavior when the balance of probabilities shows that the individual/group/organization you're dealing with is acting in bad faith.

Our modern era has so many megaphones blaring into the void that it's become significantly more difficult to determine which ones are overtly lying. Accordingly, it's far more difficult to establish a consensus about who's operating in bad faith.

Again, the failure point isn't with the assumption of good faith. It's with not recognizing bad faith when it's made manifest.

Tone policing is a time-honoured tactic for devaluing valid opposition.

Go fuck yourself you piece of shit.