Brother no one believes that. Do you not have children of your own? Its easy to see most of their personality is just innate.

Every study on genetics since forever has confirmed temperament is highly inheritable.

Higher testosterone in humans alone is responsible for higher aggression.

And that is inheritable.

There are many other factors that cause aggression aswell.

I could link you to some studies on that if you'll read them.

Some people want to deny it because they believe that means black people would be more violent genetically.

Because more than 50% of violent crime is committed by blackmales. 8% of the population.

And they are right. Black people are genetically more violent.