RE: DELETE NEGATIVE COMMENTS ON YOUR OWN POST
It's a concept that works for YouTube because it's a video website, not a social discussion platform like RCU. The nature of editing ones own posts/threads creates a more hostile environment and eventually people will be less likely to post at all because if the thread author doesn't like the comment it will be removed, whether it violates any of RCU's community policies or not. Having moderators mediate helps foster civil interaction and community growth through cordial discussion; That makes it more fun for everyone.
Should one of your threads have posts violating the rules, click the REPORT link in that post and a moderator will come in and clean it up. Sometimes they catch it themselves, other times they need the members help.