tl;dr: Separated identical twin studies have shown over and over that so much of who you are, the small quirks, the larger life goals, all of it is something that you will be naturally inclined to. Being raised healthily only serves to dampen or enhance much of what's already there.

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Mass murder, a careless disregard for human life and liberty, inflicting pain both emotional and physical onto others. Most of these are essentially switches some people simply aren't born with. People can learn or mask all they want, it doesn't mean you're not playing with a shit hand.

All people are not created equal. Many people have a significant harder time going through life because they rolled snake eyes on the genetic lottery. Our robust mountain of scientific evidence and understanding of the human brain points to nearly all of it being rooted in Scumbag Brain / Body.

Sauce:

https://www.npr.org/2023/08/11/1193176710/helicopter-or-hands-off-parenting-the-choice-wont-impact-a-kid-as-much-as-you-th

General Heritability of both IQ, Beauty, mental disorders:

https://en.wikipedia.org/wiki/Epigenetics

https://en.wikipedia.org/wiki/Heritability_of_IQ

https://en.wikipedia.org/wiki/Psychiatric_genetics

https://en.wikipedia.org/wiki/Causes_of_mental_disorders#Biological_factors

https://en.wikipedia.org/wiki/Physical_attractiveness

Aggression specifically:

https://en.wikipedia.org/wiki/Genetics_of_aggression

https://www.ncbi.nlm.nih.gov/pmc/articles/PMC539471/

https://www.ncbi.nlm.nih.gov/pmc/articles/PMC539471/

Brain structure determining who you are studies:

https://en.wikipedia.org/wiki/Causes_of_gender_incongruence#General

https://en.wikipedia.org/wiki/Pedophilia#Causes

Nurture doesn't matter as much as nature:

Helicopter or hands-off parenting? The choice won't impact a kid as much as you think

https://en.wikipedia.org/wiki/Nature_versus_nurture#Early_to_mid-20th_century

https://en.wikipedia.org/wiki/Genome-wide_complex_trait_analysis#Robust_heritability