it would be nice if we could delete our own topics, but if it wont ever happen, a good alternative would be to send a request to a moderator, or administrator, to delete a topic we have created,
this could reduce multiple topics ( with the same questions and thread names )
and if someone makes a topic, and then realizes theres another topic that askes the same question as he just did, you could delete it to reduce flooding
( iv only requested deletion of my topics that were dupplicates of other ppls topics )