You do understand that if their side does the same, you won't have any kind of moral high ground to stand on because you have already condoned stooping to their level?
Only one side of the political spectrum routinely resorts to malicious/vexatious behaviour as their modus operandi.
From what I can tell your comment about: You are talking about paradox of tolerance (https://en.wikipedia.org/wiki/Paradox_of_tolerance)
You're exaggerating. Yes, it gives up the "doxxing not OK", but there will often remain a large moral difference between "Alice was accurately doxxed as KKK/Nazi" versus "Bob was accurately doxxed as $X."
There are very few $X which are both worse, plausible, and "the other side."
We also need to ask who is going to care or be convinced. Orwell's The Party does not care about ethical or moral consistency, only power.
Exposing racism? Where is the moral problem?
This isn’t exposing people for being white but for being supremacists.
If they also expose something of the same kund of wrong I see no problem, everything I wouldn’t call doing the same.
That’s like comparing police arresting people with criminals kidnapping people, both do kind of the same: imprison people.
If "Their Side" did the same to innocent people who hadn't declared they are everyone's enemies its a completely different scenario.