Which made a lot of us wonder if Paddock's tendency toward criminality was inherited. His father left him when he was seven, but that would be enough time for imprinting his values or lack of them. The family seems somewhat un-social by the many descriptions I have read except the youngest Eric and he seemed a bit odd to me in his televised responses.
I found this article below that seems credible and it says that sociopathy is somewhat genetic. The shooter appeared to avoid being friendly with others at all. Sociopaths like Ted Bundy, often are charming, friendly and manipulative. I think killing a lot of people seems to indicate he had NO conscience. What is evil? What is mental illness? What can we learn from this at all?
Read this, just to further ponder this issue.
Understanding Genetics AND this;
The Sociopath Next Door - A detailed review