There's no need for users to delete their posts. There have been very few incidents in which users asked to have their content deleted so we let them report it and let a moderator delete it instead. I can easily see a post deletion privilege going awry with people insulting each other and then deleting their posts like they can get away with it. Either way, I don't see a post deletion privilege happening anytime soon. If there is content you wish you'd rather not have said, feel free to report it and a mod will take care of it for you