The thing is dannycookie, why should we? When all the fuss can be stopped further on in the line.
Nuts was just an example. Though isn't the best food picked fresh, where it has been exposed to probably a lot more bacteria then packaged food. I don't think it is about cleanliness but we think it is. If things are truly "clean" we are made to believe that they should be concealed, deprived from air and untouched, maybe but to such extreme extents.