I think that if an outright war is raging in the comments, let it run it’s course. All parties are willing participants, free to disengage at any moment.
The exceptions should be when illegal content is being shared or illegal activity is occurring (CP, doxxing, etc).
It’s always frustrating when a juicy argument gets locked because it’s “unproductive”. I was having a great time watching it unfold, both sides hurling both creative and uncreative insults, oblivious to how low they are sinking to. It’s great!
Something to think about as well is that all of the mods here are volunteers, and frankly if I was volunteering to moderate somewhere and one specific post kept causing issues I’d get sick of it. I honestly believe this is the driving factor for most posts getting locked