Well, imagine someone creates a thread and expounds on their opinion about something. That opinion generates posts by others, but they don't necessarily agree with the original poster. So the original poster decides to just delete the thread and erase everything, taking away the right of other posters to continue the discussion because the original poster was unhappy with the results or their thread's direction.
The possibility that things like that could -- and likely would -- happen is an example of how it can become a problem.
Ah, I see... that definitely could become a problem... but is it possible that if a user wants to delete a thread they could ask permission from a mod first who could approve it and then delete it themselves? That way we could reduce clutter on the site by deleting useless/pointless threads while still avoiding the above problem?
Edited by Raikidori, 04 September 2014 - 12:57 PM.