Then there are all the privacy issues that go hand in hand with the collection of DNA. Just like Social Security numbers and other private information are sold for commercial uses, collected DNA data will ultimately not be appropriately safeguarded, but it will be sold out. Health insurance companies, employers and other entities with invested interest, they all would love to not only gain a glimpse into a person's future (diseases etc), which DNA analysis allows to some degree, for manifold reasons ranging from the well-intended, but to the easily abused criminal forensic area all the way to commercial interests. DNA may be marketable, and why should a person have to surrender that which represents his biological entity to unknown or any use by others for their gain? Genetic determinism will be pushed as a positive and necessary thing in the evolutionary ladder.
Go ahead, collect the DNA of found guilty criminals, I'm all for it. Naturally it will lead to people being found guilty of tossing a gum wrapper in the gutter and, after having been found guilty they will be forced to surrender their DNA simply based on their conviction. To collect everyone's DNA amounts to assumption of guilt and to utter exploitation. It's just a wrong concept.
Establishing comprehensive DNA databanks is without any doubt the first step to putting into place eugenics. With eugenics, we will see genetic discrimination, racism and classism of unprecedented extent. It will mean the end of free will. Brave new world, anyone?