I pretty much agree with the sentiment, but it seems to me that what you're condoning (i.e. showing what was done wrong and then the culprit will try again and

I pretty much agree with the sentiment, but it seems to me that what you're condoning (i.e. showing what was done wrong and then the culprit will try again and improve) is problematic for many newbies. Think of the many students in math class who fear the idea of being told they're wrong more than the actual problem. I enjoy building a work environment where I can be expected to be corrected and I can safely correct people, but that is not a given in a public forum. I think the answer is to enable newbies to partake in a try-fail-try cycle but in a much more forgiving/inviting environment. The difficulty is in improving/designing that without sacrificing the overall quality of the forum.