Again, i could be wrong here, but it sounds like you're expecting a group of people who have shown no interest in moving on any of their positions to change their minds because you are drawing attention to content and behaviour...that they don't deem to be an issue in the first place.
That sounds like screaming into the void to me, but as i said, i really don't understand the nuances at play.
Injecting activity into non-.ml comms and growing them beyond the .ml version is probably the next best thing to wide defederation.
At least it gives those advocating the Threadiverse on the outside something to say when people inevitably bring up tankies on Lemmy. Makes them less relevant.
Isn't the system expected response to such irreconcilable disagreements to start your own instance (with optional hookers and blackjack), enforce your own rules and regulations there and let people decide which they prefer (if any)?
Kinda, it helps dilute the waters further, but doesn't really solve the root issue