Why does "caveman" parenting influence adult morality?

Babies develop dynamically in response to the care they receive, which influences the trajectory of their health and wellbeing. But the foundations for moral sensibilities are also influenced by early life care. The more positive touch, free play, social connection and support you got in childhood, the better attachment, mental health and social capacities you have -- but also the more open-hearted and relationally attuned to others, rather than socially withdrawn or socially oppositional you are in adulthood.