I agree, but essentially the problem is not with our uploaders.
I mentioned in another thread that most of our uploaded content is from other websites through upload bots. Because of that, metadata settings are also imported. This metadata includes ratings, notes (at least before they did), and tags. Only posts tagged as Safe (and maybe Questionable) are uploaded by the bots. Because some of the sites that upload content here through bots allow adult content, they usually don't focus much on regulating ratings tags (or don't have time to depending on how fast the upload bots work, which I don't know). That's why unsafe images find their way to the database sometimes, and why our moderators are always on alert to delete those that get through.
Thanks for your contribution on making our database more correct and complete by changing the ratings! Users like you make this site better for everyone. You can always post here in the forums or PM me or any of the other mods for any other of your concerns, questions, or suggestions.