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Seems there actually is a fair amount of research pointing to prohibiting corporal punishment for kids leads to better mental health, lower suicide rate, etc. and it does seem like a no-brainer to me that less violence leads to more stable individuals, and a more stable and happy society in general. In medieval times there was a lot of physical punishment, and society was violent, dangerous and unhappy compared to now. Singapore may be modern in many respects, but in this area, they're a bit of a backwater.
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Sometimes you don't need to make a study showing some number to act on something.

It can be a simple chain of logic saying: % of children try to test their boundaries. Of those children some get away with it, some don't. Of those who get away with it, they carry on doing it, and it has reprecussions down the line. If you look at the problem this way, it's a rational take on caning - to tighten the net against bullying.

Posted more context here:

https://news.ycombinator.com/item?id=48059470

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I've read a lot of this literature. I don't believe there is any research that shows this with a credible research design. But I'm happy to be challenged on this, so go ahead.
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I am as asian and I was at the receiving end of pretty severe (trust me you dont wanna know the details) physical abuse as a child. It did leave some lasting damage but surprisingly it didnt affect my academic outcomes and I dont feel like someone who would ever ever consider suicide for anything whatsoever.
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I interpret their argument differently. We know that bullying leads to harmful outcomes. We know that punishment reduces the frequency of undesirable behaviour. So we know that this policy will lead to an aggregate reduction in harm. The question is whether it could lead to some degree of harm to the bully. In the absence of compelling evidence of that, the policy itself seems merited.

For the record, bullying is a complex problem to solve, and no nation or policy or tactic has the silver bullet.

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One point is that "the best available evidence" is of very poor quality, with known obvious confounds and mishandling of longitudinal data. (For example, Robert Larzelere argues that by the methods used, grounding children, and giving them therapy, also harms them: (https://link.springer.com/content/pdf/10.1186/1471-2431-10-1...) Another point is that parents may be well placed to know what is best for their children - better than "experts".
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