How much does our personal behavior developmental history affect our moral behavior?

The development of a human's personal behavior, or personality, begins between approximately one and two years old. A person's behavioral development is affected by many factors, including firsthand experiences and being taught directly by those around them, such as school teachers.
People also learn indirectly from others via observation. When a child between one and five years old observes particular behaviors, they may mimic these behaviors until they become part of their own personality. This is the most common and fundamental form of learning among many animals, including humans.
For this reason, if one learns what society perceives as "unacceptable" behavior, then this will dictate the person's individual "moral compass." People learn ethics and morality through rules—such as those found in a household or school—and through laws. Moral standards are also taught by other people. When a toddler plays with matches inside the house, for example, the child will be reprimanded and taught that this is an unsafe action.
Depending on any individual's personal experiences, or what they were taught, their behavior could be considered morally sound or immoral. For instance, if a violent parent teaches their child that using violence is not wrong, and they reinforce this idea throughout the child's developmental period, that child will grow up to become an adult whose ideas clash with society's moral code.
https://depts.washington.edu/isei/iyc/crnic_17_3.pdf

https://www.uky.edu/~eushe2/Bandura/Bandura1999HP.pdf