Insecurity/underconfidence causes one of the phenotypic extrovert typologies to manifest. Extroverts are most likely subjected to abusive or controlling parenting from their formative years or prior. Sometimes the parents, themselves insecure, were just clinging and overly attentive. This type of person is on a lifelong quest for validation, not for acquiring understanding.
Introverts on the other hand usually start out early not necessarily abusively neglected but often left on their own for extended periods of time. These tend to have confident parents, sometimes overly confident to the extent of occasional neglect where the child might need attention. Extreme cases might be those who shear off the norm into full blown autistic types.
What drives extroverts is not whether they are right, but if someone will agree with them which actually has nothing to do with being accurate and so it all follows from the preceding article. This is why socialization primarily (including defensive outbursts, emotive protestations, etc.), instead of solitary study or introspection or observation then afterward sometimes bothering to communicate with others, is extroverted contrasted against introverted behaviour.