Yeah adding to this if you just removed every post (like some subreddits) then no one knows what was removed and why. Sure with lemmys mod log you could deep dive in to find the reason (if given) but publicly saying “calm down not welcome behavior” can be a useful tool to reinforce to everyone where the administrators stand. It also provides a transparency to everyone else to also allow us to keep our admins in check. Well as far as we can given we don’t own the instance as users.