Because compelling someone to give you a fingerprint is pretty easy, and could be done trivially at a border, or incident to arrest or detention, or by anyone w

Because compelling someone to give you a fingerprint is pretty easy, and could be done trivially at a border, or incident to arrest or detention, or by anyone willing to use a modicum of physical force. Plus, since liveness checks are weak, anyone with access to anything containing your prints. I suspect at the next Defcon there will be a fun challenge to defeat it given a print lifted from a glass using $5 in supplies in 30 minutes. And then at the Defcon after that, the same contest will be in the children's area.