Earlier quoted context omitted.
Humans are beastly, violent primates with marginal cognitive advantages over our cousins. Empathy is learned. I don't know if a 12 year old is more likely to kill than a 30 year old, but the former certainly has had much less social normalization toward empathy than the older one, other things being equal. Also kids are easily guided to do just about anything. They're easily impressed and even the brightest lack the…
No, healthy people are born with empathy. Which is why childhood animal mutilation is a standard test for sociopathy.
Most of the reading I've done seems to suggest that that's something that's developed at a very young age, and very sensitive to early childhood environment, rather something people are born with.