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I get why our behavior should be protected with privacy, to prevent bad actors from exploiting us. But DNA matching seems to be a reliable way to find criminals without impacting anyone’s standard of living.

Can someone explain why it’s bad to solve crimes with this data?

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I don't know if anyone else will say it, but I think part of the reason is because not every crime deserves a prosecution.

Most murders probably do, but if you have this database you might as well use it for automatic paternity tests too.

Ever spit gum somewhere you shouldn't have? If I was a cop that stepped in gum, with an instant DNA scanner in my pocket, I'd be tempted to scan it and pay the offender a visit.

Laws change very slowly, and things are going to get weird very fast when anyone can run a global DNA scan from their iPhone.

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