We see these studies every few years. I think it's really just a publication bias issue. If a result of a study is that vitamins do what they're supposed to why would you publish that? Why would the media report on that?
Further more, we're not talking about just one study here against a sea of studies in favour of vitamin supplements. Free radical theory has been shown to be effective in a petridish, but it has a neutral or negative effect in most large scale human studies.