Slavery tolerated because of "necessity" means that you do not really want to do it, but you think you must do it. An example is when you have a farm and you need people to work on it. The trouble behind this scenario is that your farm isn’t making money to pay your farm helpers their proper wages, so you resort to slavery. In this case, you do not need money for salaries because your farm is doing well to keep your slaves clothed and fed.
Slavery affirmed as a "moral right" is when you think it is your right to be the master and the slaves deserves to be slaves.
Like the previous person said, the belgium actions in the congo are considered atrocities, not genocides. although king leopold did kill many of the natives, people debate whether it should be considered a “genocide”. it’s more appropriate to label it as an atrocity than a genocide.
Transmission of communicable diseases