This is a pretty self explanatory suggestion. The lore board is an example of how unsightly mass deletes can be, and to be honest what's the purpose to me as a user to see a deleted thread and not be able to read it? Sure, it's an answer to "where did that thread go", but it's an eyesore in things like faction boards or when it shows up en masse amongst other threads.
Should be fixed. This was actually a permissions issue, those deleted posts and threads shouldn't be visible to everyone like that. If you're still seeing deleted threads or messages, lemme know and I'll figure out what the issue is.