Don't de-federate unless they're allowing the planning of violence, CSAM material, or actual abuse.

As a leftist I see it like this:

Blocking someone is: "I don't want to see this"

De-federating is: "I don't want you to see this"

Blocking someone is: Ignoring a person saying bigoted things.

De-federating is: Jailing a person saying bigoted things.

If you can't handle people saying shit you don't like then you need thicker skin. If you can't engage in a conversation with a person who shares an opinion that you fine distasteful then you need to seek maturity.

If you can't disagree with someone without physically attacking them, then you don't deserve to be part of a community. If you can't exist without abusing another person, then you don't deserve to be part of a community.

Wait, whats the argument against jailing shitty people? No one's abusing them or attacking them just nobody wants to hang with them in any way shape or form.

nobody wants to hang with them in any way shape or form

Then each person, individually, makes that choice.

If you choose to not hang out with a person in a cult that's fine. But you shouldn't block them off from every other person, what about the people who are trying to deconvert them. What about the people who are keeping an eye on them to make sure they don't do crazy things?

Your desire to interact with them should only control your actions, you shouldn't try to impose your desire to block a person or community on everyone who shares an instance with you.