100%

It's always admin drama that leads to this. Look at any of the major instance defederations and it is always a disagreement that isn't resolved because the egos of the admins involved almost immediately turn the conversation into 'agree with me or else' instead of any kind of real dialog.

In this case, the person calling for murder in their username was removed as an admin so the issue seems resolved.

Well, in this case it seems really out of place to defederate. But otherwise i like to think that defederation is something that you could use more than in last resort : yes it breaks the network, but the network should also work as broken, that's one of the strenght of federation to me. I'm not a technical person and still a newbie, so i might be missing important bits, don't hesitate to correct me if this is the case, but i felt like sharing another point of view.

Defederating violent antisemites is 100% resonable. You cannot call for violence against people for perceived Zionism. Instance admins included.