Talking with some people about it. Kaplan has gone beyond the pale with the petty defederation but Serinus' behavior (and the lack of active admins otherwise) have demonstrated that lemmy.world has insufficient moderation for admin abuse on their instance. Ruud won't lift a finger or even have any input at all. Their admin team is either corrupt or non-existent and letting them run around setting the stage for everything due to their size is untenable and unsustainable. I have no reason to believe that anyone on the admin team will do anything without pressure being applied as they've demonstrated in the past they're not willing to do anything without pressure being applied.
A reactionary administration team, especially one so emotionally charged and driven, isn't trustworthy. I'm not even sure if it can be fixed. Serinus would need to be removed from any/all position where he speaks for admins, that (frankly massive security risk, not to mention totally bypassing of the modlog) of a discord bot would have to be killed and Kaplan would need to be relegated to devops only. I have no reason to believe that @Ruud@lemmy.world will do this. Genuinely believe that, at this stage, the only reasonable option is defederation. They've proven they're not willing to listen and are willing to engage in consistent admin-level abuse.
The dog keeps getting out of its yard and biting people. No owner is around with a leash. Time to lock our gates.