It should be possible to delete your own topics/posts, ex. if you post on the wrong board, or if you post something extremely dumb and want to delete it.
We wouldn't have topics like "Badspot delete this plz" that just takes up space.
Users fault for being stupid enough to hit the post button without checking first.
deleting a topic hides the abuse you should be banned for.deleting posts just s around huge discussions with multiple people. your posted words arent any longer just yours.