I can see both sides. One the one hand, a lot of folks are hard to finger print for a variety of reasons, so the DNA does help track criminals and solve crimes. Plus we already database a lot of personal information for everyone arrested (photo, aliases, addresses, SSN, finger prints, tatoos, religion etc), so what is one more piece of data. Finally, it would be somewhat pointless to exploit the DNA info for much beyond identification--what would be the point if we determined someone had a gene for parkinsons?
On the other hand, it is much easier to drop a bit of DNA into a crime scene than either a finger print or face print. You have a crime you can't solve? Just get a hair from one of your inmates and put it at the scene. Adds a few years to his time and increases your success rate...