Wow. It appears a lot of people here don't understand behaviorism very well.
Negative reinforcement works to diminish behaviors if it is applied a) consistently (for a single specific behavior), b) immediately following the behavior, and c) assuredly (there is no means by which to escape the punishment).
In the meantime, there's a strong correlation between spousal abuse and instigation of domestic violence, and personal history of being abused as a child (of which getting hit or spanked qualifies). While I wouldn't say the causation is absolute[footnote]I was hit, spanked and even had a wooden spoon broken on me, and am particularly anti-violent. I'm also batshit insane.[/footnote], but the statistics are conspicuous, as is the frequency in which hit children grow up and attack their parents, or wind up in prison.
As one comedian points out when is a child too old to hit? When one adult hits another adult, it's considered assault and battery. Why would it be any less a crime when the victim is a child?
Teaching with violence is teaching violence. I'm pretty sure there are better ways to train a child, say by showing them the consequences of their actions. But then again, I tend to assume that children are intrinsically intersocial, cooperative, industrious creatures, and have, so far, had good results treating them as such, so my perspective may be skewed.
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