From reading most of the other topics regarding this problem of not having such a feature to delete something forever, I disagree and I feel it should be a core feature. A great example of why this feature would be useful is what if I had a category that was going to be completely closed because either the community has changed direction or that category was just not needed any more, why would I want to keep lots of topics and “hide” them? - Even if its MBs of disk space, admins should be able to delete these completely.