The NPR interviewer was wrong to suggest the policy is “heartless,” which implies indifference to the human suffering involved. The Trump administration’s policy toward Puerto Rico is heartless. The separation policy is anything but indifferent. It’s cruel.
The point is to find a route within the bounds of the various applicable legal constraints for security forces to inflict as much suffering as possible on people seeking entry to the United States. The harmfulness of the policy isn’t incidental — it’s the whole point, and it’s par for the course from an administration for whom cruelty is a watchword.