Question

A rabbi considered “serious,” who gives advice on marital harmony, education, character improvement, learning guidance, and maybe a few other areas, was giving advice mainly in the field of education.
Parents came to him who have a teenage boy who is causing trouble. He listened and told them there’s nothing to do, because when they conceived him they were not holy enough, and that’s just how it is.
 
Does a rabbi nowadays even have the ability to see problems in someone and say that the time of the pregnancy is to blame?
Is it possible that this is a root defect that cannot be corrected / educated / reshaped?
What were the parents supposed to be thinking about at the time of their union, beyond joy and pleasure? One what? Two what?
 
There are groom instructors who scare people with this story, but don’t say what one actually should think about or what one actually should do correctly.