From what I gather from a very reliable source, the 'built for purpose' box, as supplied by a regular shipper, was properly secured on the pallet with net & straps. The loadie was not, and couldn't be, aware that the box was not strong enough.
The only possible criticism could be that, because it was not a full load, nearly empty in fact, there was no ULD behind the pallet as he was trying to keep the asymmetric load as near to zero as possible.
As somebody said earlier, the shipper should get the bill, if not charged with gross negligence. Then again, how far do you go against a regular customer.
RT