I understand that, but I think your DNA is part of your personal information, and for me there's no compelling reason to turn that over to law enforcement unless there's a good reason. If somebody has voluntarily shared their genetic material knowing the risks associated, then I understand that it's publicly available and can be used by the police. I just worry that people don't understand those risks when they submit their DNA online. And we can't really know what will happen with our DNA in this emerging field as of today.
For me, this case isn't really a tale of when familial DNA searches saved the day. Yes, the outcome is extremely positive: the right guy was captured and the wrong guy was vindicated. That part I'm OK with, but this is really a failure of law enforcement for many years until Parabon got involved.
So a young woman is murdered. They pick up this guy Chris because he happens to be a local friend of somebody who's committed a violent crime in Nevada. Think about how tenuous that connection is for a second. Then they bring that guy in who changes in story 7 times until finally confessing to avoid the gas chamber they illegally told him he'd receive if he didn't. And even through all the false stories he's fed them, the one thing that he said is the real guy who did it (because they already KNOW Chris's DNA doesn't match) is named "Mike something." And, while they're at it, they'll add a rape charge for Chris even though, again, his DNA was not found on the victim.
Fast-forward years later to their decision to access the DNA of some guy who gave it to another company that was bought by Ancestry.com. That gives them a familial match, and what luck! He has a son named Mike (what are the chances???). Never mind that he's only been to Idaho like one time in his life and spends most of his time in Louisiana. They must be on to something! They spend all this time and resources accusing that guy who thank goodness is cleared. But they tell him it's definitely somebody in his family, so he can be super-suspicious of these fundamental relationships going forward.
Finally Parabon comes in and gets to work. They work up a family tree, then the cops find the obscure obituary that leads them to an as-yet unknown family member who turns out to be a match. AND HE LIVED ACROSS THE STREET FROM THE VICTIM AT THE TIME IT HAPPENED! They couldn't have found this guy at the time?
So I'm not really OK with the take-away of this episode being that cops used this amazing tool to solve a cold case. The DNA match to somebody else just took away all of their excuses for putting the wrong person behind bars 20 years ago.