Since comments/posts are not deleted from an instance, is there a tool for editing posts and comments to null and delete them?
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there is comment edit history, even if you edit them the original will still be visible
Sadge. What was the motive to have this feature?
no idea, you should search issues on github.
Anyway comments are replicated across all instances, so nobody stops someone from running a modified instance that does not abide to the comment deletion request. Same for posts, idk about images.
you should consider everything that get published public forever.