Prefrontal cortex is still developing through our early twenties. Mitigating the effects of emotional responses takes work, just like any other discipline. That work grows synapses and it's the reason mental health therapies change connectivity patterns in the brain. Leaving the word 'emotion' out (which some here seem to have strong reactions to), self-regulation is well-understood.
It may also make children smarter. Davidson notes that because social-emotional training develops the prefrontal cortex, it can also enhance academically important skills like impulse control, abstract reasoning, long-term planning and working memory. Though it’s not clear how significant this effect is, a 2011 meta-analysis found that K-12 students who received social-emotional instruction scored an average of 11 percentile points higher on standardized achievement tests. A similar study found a nearly 20 percent decrease in violent or delinquent behavior.
Goleman isn't mentioned.