Alot of threads are worth archiving. There is alot of information to be referenced, so I think it's important we keep them open and deny them from being deleted. Most of the time when a user requests for their thread to be locked, the mods usually do it. It's not a complicated, or difficult setup. If you want your thread locked, asked. No need to allow a bunch of kids to have power over locking or deleting discussions. Because if someone chooses to delete the thread, there goes post count, there goes any credible information person X may have gave, then people will start wondering what the heck happened to the thread.
Mods are nominated to manage threads and posts, we gave them the power to decide whether our own threads should remain open or closed. With the exception of Ferret, I have no idea which genius made that guy a mod.