Answer:
Well, it's like with Suffragettes, a group of women fighting for the rights of women, well it's not completely like it, however, with the fight for women's rights, society had created a certain mindset, that women were a weaker sex, and that all and any of their value came with how the men saw them, they had no rights and they were thought of to need men. With Slavery, society had created a certain mind set that most people no longer hold, they believed that people of colour were lower than them, that they didn't deserve to have rights. The dehumanized them like they did with people from India, and as they dehumanized the slaves, it was easier for them to be able to treat them so poorly. Society had created this view and everyone else agreed. It was to help themselves and take over. Not to mention that Glory, Gold and Land was so important back then, people really didn't care about others, if they felt like someone wasn't of their status, they treated them poorly. Just like in Harry Potter, the purebloods had all gotten this ideology that they were better than anyone less than them, they taught their children and acted on their beliefs.
Explanation:
