I'm a retired teacher (36 years), and I have contempled your born evil vs environment several times.
One prime example I recall was a high school druggie, runaway, in trouble at school, school transferred twice, never graduated female. She even lied in one school encounter and said her mother was dead. Mother had to prove to school she was her mother. In juvenile detention center. Psychiatric help did nothing.
Now, at age 45, this woman is an alcoholic, cheated on all prior husbands, one cheat with brother of husband. On another cheating episode she actually had her husband take her to airport, pick her up after a fake business trip, which was nothing more than spending a week with another man. She is now onto marriage #4. She constantly lies about education and experience on resumes. I know her family who have totally disconnected with her after she cheated with her sister's fiance, ending that relationship. This female's brothers and sister didn't get into trouble in school, are normal people with normal jobs and children. They had the same environment, a stable family. So, was she born evil?