Why moderate questions and replies?

I wonder if a forum such as this really calls for moderation of questions and answers. Like me many of you may be posting questions in need of a prompt response. It is so annoying to wait for the replies or questions to be displayed/accepted in the forum. I think the +Rate and Report feature is enough for a user to get the idea if his or her replies or questions are appreciated by other users. If there is a Report on a post then it is recommendable for a moderator to take whatever action is necessary according the forum rules/guidelines. Moderation is understandable if the forum deals with social/political or highly sensitive matters. This is a forum for codeigniter! I don't think any sensitive matter will be discussed here which will hurt anybody's sentiments or cause an uproar somewhere someplace else in this planet!