I don't know if keeping the usernames visible is a good or a bad thing at this point, but it kinda sucks for insecure people who don't wanna get roasted lol
... you don't get it.
If you made a post, on lemmy, and then deleted it?
... you didn't actually delete it.
Somebody already archived it. Some three letter organization, probably many of them, and they often talk to each other.
An undelete instance would just make that more obvious to more people.
If you're worried about persecution due to being a minority or supporting them... you need to actually learn how to secure your online communications, you need to figure out how to effectively seperate your real identity from your online one.
Lemmy is public.
Anyone can archive the entire thing, at any time. If you are worried about the fascists, as you should be, you need to learn actual security and privacy practices.
... the internet is forever.
The doorkickers aren't going to care that you 'deleted' your post after they already made a copy of it.