One Problem with Science

So I was reading this article, it was about the West Nile Virus and the fact that it is now in the Toronto area.   Anyway it talked about how effective precautionary measures are ( read full article here).   So the beginning of the article reads:

"Ever wonder whether dousing yourself with mosquito repellent, donning a shroud of clothing or staying indoors after dusk really will prevent West Nile infection? Well, now there's proof such measures actually do work. In fact, a study to be published next month suggests that using even two of the recommended mosquito-busting safeguards can chop the risk of contracting West Nile virus in half. "There's always been the public health messaging about West Nile and about using protective behaviour, but no one's ever quantified it," said lead author Dr. Mark Loeb, an infectious disease specialist at McMaster University. "The messaging is correct . . . this is not just common sense, but it's evidence-based," Loeb said Thursday from Hamilton. "You will actually substantially reduce your risk of becoming infected with West Nile if you use these personal protective behaviours.""

Am I the only one that sees the stupidity of the statement that "[its] just commoen sense, but it's evidence-based."?   I think some in the science world, who are so arrogant as to thing that if science doesn't prove it, it can't mean something.  
E.g.It's common sense that one should built a house on the edge of a cliff that has had a tendency to randomly collapse.   Just because it "hasn't been proved scientifically" doesn't mean one can't come to a conclusion.   Anyway see you all.
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