I am sure that is the main part of it, but there is probably a certain amount of complacency and ignorance in play. I would guess that, for the vast majority o

I am sure that is the main part of it, but there is probably a certain amount of complacency and ignorance in play. I would guess that, for the vast majority of bulk-cargo voyages, there is no noticeable shifting, making it it easy to assume that it is not a risk. A captain who has never experienced the problem is probably less likely to stand up to the shipper (and the ship owner's management, which is an issue in itself) over whether a cargo is fit to ship. The article linked by pasta shows that the problem has been recognized and regulated, for some cargoes, a while back (e.g. grain in 1982), but the lesson has not been generalized.