

It makes perfect sense to me that people who suffer abuse or neglect when young would develop a deep-rooted drive to look out for themselves first and foremost. It would be (literally, socially, and emotionally) a survival mechanism. Unfortunately, it would leave less room than others might have for empathy.
I don’t imagine this would ever go away completely, even if their situation improved by adulthood.
Peer review is for scientific papers, not lab results. If you have reason to question the lab that produced the results, then please share it.