Why are deleted topics shown on the front page? Why are they shown at all?
I think they disappear after a while.
I think it’s an anti-spam/abuse measure, to prevent malicious actors from posting spam/abusive messages (so the messages or the titles get some visibility) then deleting them before they can get reported to moderators. This way they stay around in a deleted state for some time (a day I think?), so if there were tons of them it would be noticeable and folks could check the history/edits to report them if needed.
Thanks for the explanation!