Depends on what you’re interested in and how deep you want to delve into the human psyche. There are many books that will give a general overview of what makes people behave in certain ways. There are books that go a lot deeper and explore how the human mind develops and how a poor environment growing up damages a person. What Scott has said is true but there are many reasons why people act badly and many reasons why people unknowingly and unwittingly sabotage their own path forward in life. The one constant is maladaptive behaviour to circumstances that have damaged their psyche as a younger person. The maladaptive behaviours that will manifest themselves depend on a combination of the individual’s natural personality traits and the the dysfunctional environment that they have been subjected to.