The yelling that seems to work but costs you later
Yelling works in the short term: the child stops, obeys right away, and the adult feels relief at having solved it. The problem is the side effect. A raised voice teaches a kid to obey out of fear, not because he understood why something matters, and fear has an expiration date: it disappears as soon as the child finds the courage to push back, usually in the teenage years.
Markham doesn't blame the parent who yells after a whole day of work, chores, and overdue bills. She points out that nobody yells because they want to; they yell because the patience tank ran dry well before bedtime. The point of the book isn't to demand sainthood, it's to show that you can refill that tank before it blows.
Every yell also teaches a silent lesson: that taking your stress out on whoever is nearby is acceptable, as long as you're bigger and stronger. It's that lesson, more than the scolding itself, that the author wants to interrupt.
