So, people would be able to delete their threads cursing, flaming and other just to don't humiliate them selfs and the mods could not have proofs to give 'em a Rule Violation?
Joaopcvcastro already gave the main reasons why these things are not a good idea.
also it doesn't happen too often that a thread must be deleted. if it happens: simply edit the thread content+title to something like "PLEASE DELETE ME" OR contact a moderator or me to delete it.
some people might think that it is a good idea to delete a thread when the problem is solved. but it's not because people might have the same problem later and search for it.
lettings others edit a thread is a horrible idea. pure chaos!
Perhaps this is a case where the delete-thread function would be handy? Although I must agree that letting others edit your post is a really bad idea, I think a delete thread function would be pretty cool. Or perhaps it could simply remove it from it's placing on the portal? Idk, whatever you think is best is what goes.
nope delete wont happen because some fucking trolls would flame and spam the fucking hell out of their asses and quickly remove their shit before mods see it or insane crap like that.