"the Western estimate happens to involve much more violence."
Having given this issue further thought over the last few days, I would like to add that, while both Western and non-Western parents are obliviously violent towards children, I get an anecdotal impression (notwithstanding many individual exceptions which I am sure exist) that non-Western parents' violence mostly occurs in serious contexts, whereas a significant fraction of Western parents' violence seems to be done in a joking manner. To the extent that the latter seems likely to cause more confusion in the victim than the former, it could be considered worse.