I am fully aware that the DNA had gone through a lot of criticism in the early days after the crime. What you seem to fail to realize, though, is that through innovation they were able to develop a full profile of this DNA. And not only that, they were able to match all of it from the corresponding areas to this same profile.
This is why the Ramsey's are no longer considered suspects. This is why your above argument is no longer relevant. Now, I actually agree somewhat that maybe the Ramsey's should not be totally out of the woods. But it is time for all of us to start thinking out of the box and realize this case has moved WAY past these really Old articles from the beginning of this case.