[ahelwer]

The quote doesn't give brilliant insight into a complicated problem. It just states an opinion and ties a bow on it. There are swathes of such quotes, and you can find one to support nearly any viewpoint. Of the swathes, however, this particular quote has been beaten to a veritable pulp through (mis)use. It is second in prevalence only to invocation of Godwin's law in discussions of this topic (incidentally, there's a nice example of that below).