Earlier quoted context omitted.
"Here [at the Yale Parenting Center], we deal with two kinds of children. One is that they are very aggressive and have serious psychiatric problems. And the other one is that they come in for normal kinds of issues that parents just want some help on." I don't think these people are just dispensing pop psych advice in magazines or once a week. It's a clinic.
I personally know a child who was a literal hellspawn for 10+ years and would not respond to any kind of newfangled therapy Then his dad got too mad over him literally failing school and leather belt fixed him within a year Which was not a single stop solution either
I have two kids, and as angry as they can make me, I always find that calming the situation down is way better than escalating it.