I agree with this statement. Assume a risk.
> I assert that the null hypothesis is that it does not have a benefit and is harmful.
Why did the word 'risk' disappear here? I don't think that's a good null hypothesis at all.
> You, on the other hand, if I understand properly, are saying that we should be able to do whatever we like to a punish person unless we show it directly causes harm.
I am not saying that.
What null hypothesis would you prefer?
> I am not saying that.
Then what are you saying?
"It has no lasting effects", probably.
And you need to make sure you're looking for both positive and negative effects.
"It's harmful" is a huge bias for a null hypothesis.
> Then what are you saying?
That you shouldn't assume it is harmful.
I didn't say anything about what parents should be "able to do". I didn't even give an opinion on the candy thing. I just think your justification is a big overreach.
But also a null hypothesis implies you're currently doing the testing, so that's a different scenario too...