This a suggestion for mods and admins, for a button to delete threads, instead of locking them, because it takes up a load of pages. Once again only a suggestion
People will then lose points. Just because a thread is not good for being kept open doesn't mean the posts in it are bad, and considering having posts deleted is a bit of a punishment for many users, it would hardly be fair for them to lose their posts. More so, often threads contain a lock message as to why the thread was locked, and it can be referred back to by other mods, should someone complain, or a duplicate arise.
Some threads does get deleted. You just don't see it, because they are deleted.
The threads that generally get deleted are the ones that obviously violate the T&C and doesn't have much "content" to mull over. If an OP posts something as such and users unfortunately post inside, then it will get deleted and the users can refer to their lost AP as a reminder to not do so. Especially if said thread is obviously trolling and the users take the bait. Depends on the thread and the amount of replies that are already present to me.