Finally

Something that makes sense.

Psychopathic Traits Seen in Children’s Brains

The researchers focused on several brain areas known to play a role in empathy, including the anterior insula, which sits deep in the brain; the anterior cingulated cortex, a deep layer that sits behind the forehead; and the inferior frontal gyrus, a ridge of brain matter on the frontal lobe.
In all three regions, kids with conduct problems showed reduced brain activity when viewing images of pain compared with the The children were matched on age, IQ, socioeconomic status and ethnicity to reduce the chance of unrelated factors skewing the results.

Here's the good part.  Instead of announcing some newfangled name for this phenomenon, they actually try to come up with a plausible mechanism:

"It may be that these children have atypical arousal response to pain — for example, those children who are most callous may not feel pain as keenly as their peers, and this may, in turn, mean that they find observing pain less distressing than their peers," Viding said.

Yes. Yes. Yes.  Yes.   Yes.