It’s not effective? He should have a talk with my father…you want to see a couple kids straighten up, dad threatening to get his belt usually did the trick and if it didn’t using the belt almost always did.
I’m a believer in this as well. From what I’ve seen of children and teenagers and even twenty-somethings who were raised in a non-disciplined, “child-guided” way that is limited solely to “positive reinforcement” (which, when not countered with negative reinforcement, are merely bribes) are generally not the best of people, and are what would have been called spoiled brats.
It would seem that the lack of discipline would lead to more mental issues later in life, and experience would seem to bear this out. Even thinking on it, a child who is only “positively reinforced” might grow up to expect to be paid or bribed for every action of common decency, let alone more; believe from an early age that he is the best (from parents always praising their children without ever scolding, leading the child to even subconsciously believe that he can do no wrong), and instill either a perfectionism or a self-defeating complex in the child when he learns that he is not; an inability to cope with failure, and so forth.
Solomon tells us:
“He who spares the rod hates his son: but he that loves him corrects him…” (Prv 13:24) and “Do not withhold correction from your child. If you strike him with the rod, he shall not die. You shall beat him with the rod, and deliver his soul from Sheol.” (Prv 23:14)
The “beating” may be a bit far, but it seems to me that in societies with lax discipline of children (such as modern America) children have more issues: depression, bipolar disorder, borderline personality, narcissism, anger management problems, less respect for parents, more bullying, lower rates of academic success, more “acting out”, more drug addiction, promiscuity, so on. Such conditions are not nearly as endemic a problem in societies that have a more traditional approach to child-discipline. Corporal punishment seems to be a necessary evil, until God so decrees that children are born with an inbuilt and fully-formed decision-making apparatus and moral compass.
A toddler or young child can not be spoken to and made to understand like an adult, as his rational faculties are not developed, and, I imagine, he will view the punishment as “light”, or “bearable”, and, if the consequence does not outweigh the benefit of the bad behavior, there is no reason not to repeat it: a child does not have the mind nor moral faculties of an adult, and the higher moral functions need to be instilled as the child is formed. Not even do “legal adults” have fully instantiated rational/decision-making faculties, at least until 25 years of age.