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I’m not sure what OP meant but I think none of the comments here are nailing it. If we say, we can’t do anything unless it’s 100% certain that all instances comply with the protocol, we might scrap the whole Fediverse idea altogether. Any post or comment or vote or deletion could be tempered with in one way or another. I mean we’re clearly making an effort here to do federation. I don’t really agree with the why and how of the whole discussion. My own point is, the software seems to have some bugs. Rarely, some comments and posts don’t federate to me correctly, and more often than that, deletions don’t federate correctly. Which seems to be one of OP’s problems, but also while dealing with spam or malicious activities.
On the other hand, everyone who thinks it’s super easy to just delete everything has never had a look at the consequences. Moderators and Admins sometimes need to deal with bad people, there are technical reasons involved. And bad people also misuse features. It’s complicated for several reasons, difficult to get it right and it’s always a balance between opposing legitimate interests.
But with that said, this doesn’t apply to bugs. Lemmy should at least iron out the software bugs to federate activities to other instances properly.
Two things to consider: