The law
i think hope this helps
An undeveloped prefrontal cortex is partially responsible for impulsiveness in young children. The prefrontal cortex, which is a part of the brain located at the front of the frontal lobe, is the "executive" of the brain, because it is a crucial part of the brain, involved in planning, prioritizing, and reflection. If not fully developed these functions are not working properly.
The school of thought that would most likely agree with uncle John is behaviorism.
Behaviorists believed that every type of action and behavior should be observed so as to be researched. If it cannot be directly observed, it doesn't require particular attention because it is not as relevant. Some famous behaviorists are Skinner, Watson, Pavlov, etc.