Two wrongs don’t make a right. I object to non-consensual collection of newborn DNA as well.
And it’s not bringing murderers to justice per se. It’s the implications to others. I don’t want MegaCorp extrapolating my medical history via my cousin’s DNA.
Yeah, but now you're associated with a killer, whatever SNPs you share pile up into correlates.
Insurance companies see you as feckless, lenders see you as risky, law enforcement sees you as a likely criminal, justice sees you as a burden.
And maybe it wasn't even you that volunteered the sample. And maybe I share some of the SNPs, and maybe I have some countermutations, but they aren't properly analyzed. Now my feet are in the fire despite no predisposition to violence or recklessness just an association.
This is one step and I expect another. For the greater good, for security, for the safety of the nation, for the children.
Also, bringing murderers to justice is a pretty odd thing to object to.
[1] https://www.aclu.org/documents/newborn-dna-banking